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
When a Villain enters the battlefield under your control, your opponents each lose one life, while you gain one
While this is a good disruptive piece, it doesnt replace protection spells like Slip Out the Back, so make sure you balance your protection package appropriately
Bring it in against someone who has multiple targets
The Odds Aren't Great Karakas is an incredibly powerful land and because of this, it is highly unlikely that it will ever be playable in Commander
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