Blue Diamond, True Sorrow

: Creatures opponents control get -1/-0 as long as you've cast a noncreature spell this turn.
+1: Mill three cards, then exile an artifact, instant or sorcery card from among them. You may cast that card as long as it remains exiled.
-2: Tap target creature. Put X stun counters on it, where X is the number of cards you own in exile plus one.