If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play
It's especially useful for creatures that want to hit the opponent in order to trigger an effect
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It may actually see a little fringe Constructed play in ramp builds, though most decks right now can take advantage of a ton of mana