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Making an opponent shuffle away an artifact is quite potent

Even if the arch type is Trap-based and Paleozoic-Frog decks usually run 25+ Trap cards (at least in the TCG, the OCG had versions with less Trap cards which included normal LV2 Aqua type monsters like Slime Frog together with Rescue Rabbit, which is unlimited in the OCG, and Unexpected Dai)

However, Eutropia turns garbage auras into tempo swings and critical weapons that your opponents will not see coming

These turn infinite mana into one-hit kills, but I think they showcase the power of infinite combos more than the creatures themselves, so Im leaving that whole collective of creatures off the list unless they do something more direct

The second ability costs X, and it lets you Destroy each nonland permanent with converted mana cost X whose controller was dealt combat damage by Steel Hellkite in that turn