hxh booster box Union Arena: Hunter x Hunter Vol. 2 [UEX04BT] and Secret Rare (SR) while AP cards are included at a low pull rate Unboxing All The Union Arena

The infinite combo linchpin is (to my surprise) Hullbreaker Horror

Behind the doors are monsters which he must destroy with his own cards to progress

How many challenge decks are there to beat

House, President and CEO 0.2%inclusion 2.47K decks 1.07M decks Reprints Sol Ring 83%inclusion 7.92M decks 9.49M decks Command Tower 74%inclusion 7.03M decks 9.49M decks Arcane Signet 72%inclusion 6.83M decks 9.49M decks Exotic Orchard 37%inclusion 3.49M decks 9.49M decks Swords to Plowshares 61%inclusion 2.67M decks 4.41M decks Swiftfoot Boots 27%inclusion 2.56M decks 9.49M decks Lightning Greaves 25%inclusion 2.35M decks 9.49M decks Path of Ancestry 22%inclusion 2.12M decks 9.49M decks Path to Exile 47%inclusion 2.09M decks 4.41M decks Rogue's Passage 20%inclusion 1.91M decks 9.49M decks Evolving Wilds 20%inclusion 1.91M decks 9.49M decks Cultivate 42%inclusion 1.83M decks 4.38M decks Thought Vessel 17%inclusion 1.63M decks 9.49M decks Blasphemous Act 34%inclusion 1.59M decks 4.73M decks Farseek 36%inclusion 1.57M decks 4.38M decks Rampant Growth 32%inclusion 1.41M decks 4.38M decks Terramorphic Expanse 15%inclusion 1.39M decks 9.49M decks Myriad Landscape 14%inclusion 1.38M decks 9.49M decks Chaos Warp 29%inclusion 1.37M decks 4.73M decks Heroic Intervention 31%inclusion 1.34M decks 4.38M decks Mind Stone 14%inclusion 1.31M decks 9.49M decks Solemn Simulacrum 12%inclusion 1.12M decks 9.49M decks Skullclamp 11%inclusion 1.07M decks 9.49M decks Temple of the False God 8.7%inclusion 824K decks 9.49M decks Sulfur Falls 36%inclusion 812K decks 2.24M decks Clifftop Retreat 36%inclusion 804K decks 2.21M decks Dragonskull Summit 36%inclusion 786K decks 2.20M decks Cinder Glade 38%inclusion 784K decks 2.06M decks Sunken Hollow 33%inclusion 783K decks 2.34M decks Talisman of Dominance 32%inclusion 753K decks 2.34M decks Isolated Chapel 35%inclusion 749K decks 2.15M decks Smoldering Marsh 34%inclusion 748K decks 2.20M decks Glacial Fortress 34%inclusion 738K decks 2.16M decks Hinterland Harbor 35%inclusion 731K decks 2.11M decks Vandalblast 15%inclusion 722K decks 4.73M decks Canopy Vista 35%inclusion 710K decks 2M decks Prairie Stream 33%inclusion 707K decks 2.16M decks Drowned Catacomb 30%inclusion 692K decks 2.34M decks Woodland Cemetery 34%inclusion 681K decks 2.03M decks Wayfarer's Bauble 6.8%inclusion 650K decks 9.49M decks Talisman of Creativity 28%inclusion 623K decks 2.24M decks Rootbound Crag 30%inclusion 612K decks 2.06M decks Deadly Dispute 13%inclusion 608K decks 4.82M decks Talisman of Indulgence 28%inclusion 606K decks 2.20M decks Sunpetal Grove 29%inclusion 584K decks 2M decks Talisman of Hierarchy 27%inclusion 573K decks 2.15M decks War Room 5.8%inclusion 547K decks 9.49M decks Talisman of Progress 25%inclusion 546K decks 2.16M decks Talisman of Conviction 24%inclusion 536K decks 2.21M decks Anguished Unmaking 25%inclusion 533K decks 2.15M decks Farewell 11%inclusion 507K decks 4.41M decks Austere Command 11%inclusion 502K decks 4.41M decks Hardened Scales 11%inclusion 462K decks 4.38M decks Buried Ruin 4.7%inclusion 446K decks 9.49M decks Ash Barrens 4.7%inclusion 443K decks 9.49M decks Wild Growth 10%inclusion 432K decks 4.38M decks Pitiless Plunderer 8.7%inclusion 420K decks 4.82M decks Everflowing Chalice 4.2%inclusion 394K decks 9.49M decks Morbid Opportunist 8.1%inclusion 390K decks 4.82M decks Basilisk Collar 4.1%inclusion 388K decks 9.49M decks Panharmonicon 3.9%inclusion 374K decks 9.49M decks Hullbreaker Horror 7.9%inclusion 368K decks 4.68M decks Inspiring Call 8.4%inclusion 367K decks 4.38M decks Temple of Epiphany 16%inclusion 361K decks 2.24M decks Unexpected Windfall 7.6%inclusion 358K decks 4.73M decks Temple of Silence 16%inclusion 353K decks 2.15M decks Temple of Triumph 16%inclusion 345K decks 2.21M decks Scavenger Grounds 3.6%inclusion 338K decks 9.49M decks Jungle Shrine 30%inclusion 337K decks 1.12M decks Temple of Enlightenment 16%inclusion 336K decks 2.16M decks Temple of Mystery 16%inclusion 336K decks 2.11M decks Guardian Project 7.6%inclusion 334K decks 4.38M decks Darkwater Catacombs 14%inclusion 334K decks 2.34M decks Harmonize 7.6%inclusion 332K decks 4.38M decks Bastion of Remembrance 6.8%inclusion 327K decks 4.82M decks Putrefy 16%inclusion 322K decks 2.03M decks Temple of Deceit 13%inclusion 316K decks 2.34M decks Skycloud Expanse 14%inclusion 312K decks 2.16M decks Temple of Malady 15%inclusion 309K decks 2.03M decks Nomad Outpost 28%inclusion 301K decks 1.07M decks Branching Evolution 6.9%inclusion 300K decks 4.38M decks Mystic Monastery 28%inclusion 297K decks 1.08M decks Opulent Palace 28%inclusion 295K decks 1.06M decks Spire of Industry 3.0%inclusion 289K decks 9.49M decks Mystic Forge 2.9%inclusion 276K decks 9.49M decks Tainted Wood 13%inclusion 273K decks 2.03M decks Shadowblood Ridge 12%inclusion 271K decks 2.20M decks Tainted Field 13%inclusion 270K decks 2.15M decks Temple of Malice 12%inclusion 270K decks 2.20M decks Sungrass Prairie 13%inclusion 268K decks 2M decks Walking Ballista 2.8%inclusion 266K decks 9.49M decks Talisman of Curiosity 12%inclusion 255K decks 2.11M decks Dispatch 5.8%inclusion 254K decks 4.41M decks Talisman of Resilience 12%inclusion 250K decks 2.03M decks Temple of Plenty 12%inclusion 249K decks 2M decks Treasure Vault 2.6%inclusion 249K decks 9.49M decks Tainted Peak 11%inclusion 246K decks 2.20M decks Tainted Isle 10%inclusion 245K decks 2.34M decks Temple of Abandon 12%inclusion 244K decks 2.06M decks Mossfire Valley 11%inclusion 235K decks 2.06M decks Nesting Grounds 2.4%inclusion 225K decks 9.49M decks Crucible of Worlds 2.2%inclusion 214K decks 9.49M decks Puresteel Paladin 4.7%inclusion 208K decks 4.41M decks All That Glitters 4.6%inclusion 204K decks 4.41M decks Sheltered Thicket 10%inclusion 199K decks 2.06M decks Tireless Tracker 4.5%inclusion 198K decks 4.38M decks Ruinous Ultimatum 18%inclusion 197K decks 1.07M decks Intangible Virtue 4.4%inclusion 194K decks 4.41M decks Windbrisk Heights 4.4%inclusion 194K decks 4.41M decks Black Market 4.0%inclusion 193K decks 4.82M decks Mortuary Mire 4.0%inclusion 191K decks 4.82M decks Canyon Slough 8.5%inclusion 187K decks 2.20M decks Loyal Apprentice 3.8%inclusion 178K decks 4.73M decks Champion's Helm 1.8%inclusion 174K decks 9.49M decks Steel Overseer 1.8%inclusion 167K decks 9.49M decks Irrigated Farmland 7.7%inclusion 166K decks 2.16M decks Rancor 3.8%inclusion 166K decks 4.38M decks Fetid Pools 6.9%inclusion 161K decks 2.34M decks Mechanized Production 3.1%inclusion 144K decks 4.68M decks Scattered Groves 7.2%inclusion 144K decks 2M decks Wear // Tear 6.4%inclusion 142K decks 2.21M decks Inexorable Tide 3.0%inclusion 140K decks 4.68M decks Hour of Reckoning 3.2%inclusion 140K decks 4.41M decks Fertile Ground 3.2%inclusion 138K decks 4.38M decks Razortide Bridge 6.4%inclusion 138K decks 2.16M decks Fireshrieker 1.4%inclusion 132K decks 9.49M decks Silverbluff Bridge 5.6%inclusion 126K decks 2.24M decks Wasteland 1.3%inclusion 123K decks 9.49M decks Rustvale Bridge 5.4%inclusion 120K decks 2.21M decks Secure the Wastes 2.7%inclusion 120K decks 4.41M decks Keeper of the Accord 2.7%inclusion 119K decks 4.41M decks Vigor 2.5%inclusion 111K decks 4.38M decks Lethal Scheme 2.3%inclusion 110K decks 4.82M decks Martial Coup 2.5%inclusion 109K decks 4.41M decks Mantle of the Ancients 2.5%inclusion 109K decks 4.41M decks Grave Titan 2.2%inclusion 107K decks 4.82M decks Contagion Clasp 1.1%inclusion 106K decks 9.49M decks Corpsejack Menace 4.9%inclusion 98.5K decks 2.03M decks Masterwork of Ingenuity 1.0%inclusion 91.8K decks 9.49M decks Hornet Queen 2.1%inclusion 90.8K decks 4.38M decks Bloodforged Battle-Axe 0.9%inclusion 90.1K decks 9.49M decks Casualties of War 4.3%inclusion 86.6K decks 2.03M decks Sticky Fingers 1.8%inclusion 83.5K decks 4.73M decks Single Combat 1.7%inclusion 76.3K decks 4.41M decks Thirst for Knowledge 1.6%inclusion 75.1K decks 4.68M decks Wake the Past 3.4%inclusion 75.1K decks 2.21M decks Winding Constrictor 3.7%inclusion 74.7K decks 2.03M decks Assemble the Legion 3.2%inclusion 71.5K decks 2.21M decks Whirler Rogue 1.5%inclusion 70.1K decks 4.68M decks Explorer's Scope 0.7%inclusion 68.5K decks 9.49M decks Abundant Growth 1.4%inclusion 63K decks 4.38M decks Valorous Stance 1.3%inclusion 58.7K decks 4.41M decks One with the Machine 1.2%inclusion 54.3K decks 4.68M decks Fraying Sanity 1.1%inclusion 53.7K decks 4.68M decks Squirrel Nest 1.1%inclusion 47K decks 4.38M decks General's Enforcer 2.2%inclusion 46.5K decks 2.15M decks Lord of the Undead 0.9%inclusion 43.7K decks 4.82M decks Behemoth Sledge 2.1%inclusion 41.9K decks 2M decks Roadside Reliquary 0.4%inclusion 41.3K decks 9.49M decks Gemrazer 0.9%inclusion 40.4K decks 4.38M decks Captain of the Watch 0.9%inclusion 40.1K decks 4.41M decks Open the Vaults 0.9%inclusion 39.2K decks 4.41M decks Crush Contraband 0.8%inclusion 36.6K decks 4.41M decks Stolen Strategy 0.7%inclusion 33.9K decks 4.73M decks Impassioned Orator 0.8%inclusion 33.5K decks 4.41M decks Entrapment Maneuver 0.8%inclusion 33.4K decks 4.41M decks Marshal's Anthem 0.7%inclusion 32.9K decks 4.41M decks Biomass Mutation 1.5%inclusion 30.8K decks 2.11M decks Brass Knuckles 0.3%inclusion 30.1K decks 9.49M decks Fervent Charge 2.7%inclusion 28.8K decks 1.07M decks Find // Finality 1.4%inclusion 27.5K decks 2.03M decks Glimmer of Genius 0.5%inclusion 24.8K decks 4.68M decks Memorial to Glory 0.5%inclusion 20.7K decks 4.41M decks Heroic Reinforcements 0.7%inclusion 16.4K decks 2.21M decks Ayula, Queen Among Bears 0.4%inclusion 15.6K decks 4.38M decks Tarmogoyf 0.3%inclusion 13.2K decks 4.38M decks Ravages of War 0.2%inclusion 9.06K decks 4.41M decks