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N's Zoroark ex
I cant recommend Spore Frog in good conscience, because it invariably ends up being looped and grinding a game to a halt
Sarulf, Realm Eater Sarulf, Realm Eater is truly a realm eater given its abilities, which allow it to exile nonland permanents equal to the number of +1/+1 counters on it during your upkeep
Beyond that, if your board is littered with a lot of blue pips after playing cards such as Future Sight, Arcanis the Omnipotent, Azami, Lady of Scrolls or any other cards with blue in their casting cost which, if youre playing Wizards, will likely be most of them then the ability to win the game on the spot becomes even easier, making this tricky little Merfolk an unassuming yet powerhouse threat for Wizards
They will transform only when the last counter is removed, not if they are destroyed