This means that if an opponent controls a creature you own, its death causes Bridge from Below's first ability to trigger, not its second
One of the most famous examples of this was The One Ring in the Lord of the Rings: Tales of Middle-earth crossover back in 2023, which was a one-of-a-kind card that ended up being sold to Post Malone for a whopping $2.6 million

Heres my old deck, pre-changes: Creatures (13) 1 Darksteel Colossus 1 Solemn Simulacrum 1 Glory 1 Genesis 1 Eternal Dragon 1 Cromat 1 Etched Oracle 1 Academy Rector 1 Stuffy Doll 1 Spearbreaker Behemoth 1 Ulamog, the Infinite Gyre 1 Darksteel Sentinel 1 Etched Monstrosity Planeswalkers (19) 1 Ajani Goldmane 1 Chandra Nalaar 1 Liliana Vess 1 Ajani Vengeant 1 Sarkhan Vol 1 Elspeth, Knight-Errant 1 Nicol Bolas, Planeswalker 1 Sorin Markov 1 Jace, the Mind Sculptor 1 Gideon Jura 1 Sarkhan the Mad 1 Venser, the Sojourner 1 Elspeth Tirel 1 Karn Liberated 1 Jace, Memory Adept 1 Chandra, the Firebrand 1 Garruk Relentless 1 Sorin, Lord of Innistrad 1 Xenagos, the Reveler Lands (35) 1 Forest 1 Plains 1 City of Brass 1 Kor Haven 1 Swamp 1 Mountain 1 Island 1 Underground Sea 1 Tropical Island 1 Taiga 1 Scrubland 1 Savannah 1 Plateau 1 Bayou 1 Overgrown Tomb 1 Sacred Foundry 1 Temple Garden 1 Watery Grave 1 Godless Shrine 1 Stomping Ground 1 Blood Crypt 1 Breeding Pool 1 Hallowed Fountain 1 Arcane Sanctum 1 Crumbling Necropolis 1 Jungle Shrine 1 Savage Lands 1 Seaside Citadel 1 Exotic Orchard 1 Reliquary Tower 1 Rupture Spire 1 Mystifying Maze 1 Command Tower 1 Sulfur Falls 1 Mana Confluence Spells (32) 1 Wrath of God 1 Sol Ring 1 Demonic Tutor 1 Darksteel Ingot 1 Honden of Seeing Winds 1 Honden of Night's Reach 1 Honden of Life's Web 1 Honden of Infinite Rage 1 Honden of Cleansing Fire 1 Collective Restraint 1 Legacy Weapon 1 All Suns' Dawn 1 Raka Sanctuary 1 Necra Sanctuary 1 Dega Sanctuary 1 Ceta Sanctuary 1 Ana Sanctuary 1 Rout 1 Privileged Position 1 Damnation 1 Austere Command 1 Martial Coup 1 Shard Convergence 1 Conflux 1 Obelisk of Alara 1 Wargate 1 Expedition Map 1 Recurring Insight 1 Phyrexian Rebirth 1 Norn's Annex 1 Batterskull 1 Call the Gatewatch And thats my initial deck, modified a bit from cards since then

Then the middle Green one-drop enchantment gives them one reduced cost and then can itself be turned down for two