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But there's a tier 2 deck in Standard that may NEED the extra cards, already has a strong base, AND will make the most out of Yorion's ETB effect

"A Dragonstorm Is Brewing, Part 1"

Anytime a player reduces their opponents active Pokmon to zero health points that card must be discarded, with the attacking player receiving one of their opponents prize cards

Mutate isnt actually an activated ability, but it is an alternate casting cost

That said, the fact that they exist is exciting in its own right, since it means Exhaust will be part of the set in some capacity

And then there's the added benefit of not worrying about your own creatures if youve built your deck around demons, devils, and imps