Crevile the White Ghost

Menace, Protection from black and white,
Trample, Shroud, Flying
When Crevile the White Ghost enters the battlefield, give it 10 blood counters. Anytime a creature dies, remove a blood counter.
Crevile the White Ghost cannot attack or block
when it has blood counters on it. When Crevile
the White Ghost dies, give target creature +8/+0
until deals combat damage to a player.