Rowian Igni Maxis

0: At the beginning of your upkeep, you may draw an additional card. If you do, discard a card unless you reveal a white creature from your hand.
+1: Target white creature you control is blue in addition to their other colors. Each player taps a creature and discards a card.
-4: Tap X creatures you don't control where X is the amount of blue creatures you control. Spells cost 1 less to cast this turn.