Alyssa, Crawler Among Crabs

Crab-Walk
At the beginning of each combat Target Crab
Gets +{x}/+{x} or -{x}/-{x} until end of turn,
X is equal to the number of Crabs in all
Graveyards.
Sacrifice a Crab: Alyssa, Crawler among Crabs
becomes a copy of target crab until end of turn.
{3}{u}{b}: Create a token copy of Target Creature,
Its a Crab in addtion to its other types.