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The thing is, Opposition Agent isn't just shutting down powerful tutors like Demonic Tutor or Vampiric Tutor, it's also shutting down ramp spells like Nature's Lore and Sakura-Tribe Elder, Fetch Lands, Situational tutors like Fabricate and a host of other spells and abilities that commonly appear in decks

That said, there are some sets that offer a lot more Commander cards than others with a reasonable price

Card Set(s) -ONE PIECE CARD THE BEST- [PRB-01] CARD VIEW OP06-079 | C | STAGE Kingdom of GERMA Block Icon 2 Effect [Activate: Main] You may trash 1 card from your hand and rest this Stage: Look at 3 cards from the top of your deck

Cards from EX Crystal Guardians can reach significant amounts, particularly for graded versions