Grinore, Thrice-Fallen

Flying, first strike, vigilance
When Grinore, Thrice-Fallen enters the battlefield, create two 1/1 white Human creature
tokens with lifelink.
Whenever Grinore attacks, you may sacrifice
another creature. If you don't, sacrifice Grinore
at end of combat.
If three or more Humans died this turn, you may
cast Grinore from your graveyard.