Jou-Yyn, The Suppressor

Flying, deathtouch, menace, hexproof from
white and from green
At the beginning of your upkeep, transform
Jou-Yyn unless you pay {1}{u}{b}{r} and tap two
other untapped Vampire creatures you control.
Whenever this creature transforms into Jou-Yyn,
The Suppressor or deals combat damage to a
player, that player discards his or her hand.