Gram Greddis, Crab Caller

Eminence —Crabs you control are Pirates in
addition to their other types and gain skulk.
{u}: Until end of turn, Crabs you control get
-X/+X where X is equal to their power minus 1.
You may only activate this ability once each turn.
{3}{u}{b}{r},{t}: Until end of turn, whenever one or
more Pirates you control deal combat damage to
your opponents, exile up to one nonland card
from each of those opponents' graveyards. You
may play those cards this turn without
paying their mana cos