Riku, The Corrupted Heart

+3: Gain 4/0 and Swift.
+3: Gain 2/2 (4) Search your deck for an event or spell card and put it in your hand. Shuffle your deck and discard a card.
+5: Gain 3/3 (3) Select one attacking or defending unit. Target gains +2/+2 if it is Dark-Aligned or -2/-2 if it isn't.