The Abyss Watchers

Haste, first strike, vigilance.
{1}{b}{r},{t}: Put a 3/3 Abyss Watcher token
with first strike, and haste onto the battlefield
under your control.
Enrage - When 4 or more abyss watcher
tokens die this creature gets +5/+5 and gains,
double strike, trample, and hexproof.