Twenty One Pilots

Trample, Flash, Hexproof
When Twenty One Pilots enters the battlefield, creatures you control gain +X/+X, draw X cards,
and you lose X life.
{b}{2}, sacrifice Twenty One Pilots: Creatures you
control gain Vibe until end of turn.
(they get +4/+4, Vigilance and First Strike, and they
really do be vibin' tho)