Cernunos, Primal Fury

Trample
Whenever Cernunos, Primal Fury enters the battlefield, you may reveal a creature card from
your hand. If you do, creatures you control get
+X/+0 until end of turn, where X is the
revealed creatures power.
Creatures you control that share a creature type
with the last creature revealed this way cost {1} less to cast.