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The broken stuff at 9 mana you want is costly already (see Expropriate), so why not already have better tutors if thats your Commander vibe

(3) When this card destroys an opponents monster by battle and sends it to the GY: You can Special Summon that monster to your zone a Link Monster points to, but its effects are negated

They even have built-in effects that outright debilitate themselves the moment a Spell or Trap Card is sent to that player's GY

However, with Gengar EX, the player can disable any Supporter cards that the opponent wants to use, which can be a great strategy for decks that rely heavily on them