mtg experience cards Gift of Experience Anarchs V:TES VTES Vampire CCG At the beginning of combat on your turn Top 5 Experience Counter Cards

In aggressive decks you might have a creature in play before this that can use the counters, so that works well there

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Super Fast Lands 37

Zealous Conscripts

It shouldnt be too hard to find a way to put a stray counter on this with some other effect, and then you have a big menace creature that you only invested 2 mana into