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The most famous use of this was Land Tax: Stay a land behind, and you don't just have unlimited lands

This is because a copy effect can't set the power and toughness of a permanent if being a creature isn't part of that permanent's copiable characteristics

This also applies to attacks that hit multiple times

Sign in Blood is comparable, but gets worse the more colors you add to your deck

Since there's no color restriction you can slot Conjurer's Closet into practically any deck, though a little bit of ramp is nice since five-mana is a bit of an awkward amount when you normally will want a higher impact card going into the mid-game