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If Costume Closet has left the battlefield or has no +1/+1 counters on it by the time its activated ability resolves, you won't put a +1/+1 counter on the target creature

Make sure to time these correctly and not lock yourself out of the game, too

Since this is a more competitive deck we want to be able to deal with different situations, and increase the brutality or quickness of the deck

Today they could still do that against a mono-color deck with lots of basics, and you can adjust the color with lots of Sleight of Mind effects

Bring it in against someone who has multiple targets

This is a hugely impactful spell that is often not respected enough in Constructed formats