Gravemind, the Everlasting

Gravemind, the Everlasting's power and
toughness are equal to the amount of Zombie
tokens you control+1
{b}{b}: Exile target creature with converted mana
cost from a graveyard. Create an X/Y Black
Zombie Alien creature token named Flood where
X is that creatures power and Y is that creature toughness.
Zombie tokens you control have menace.