SIVA Mutant, Felwinter

: You draw from your graveyard. When you cast spells with converted mana cost 4 or less, put the top 3 cards of your library into your graveyard.
+2: Discard 3 cards. Gain control of target creature opponent controls. It becomes a SIVA splicer in addition to its other types.
-13: Gain control of up to four target creatures opponent controls. Splicers you control get +5/+5 and gain trample. Double your life total.