Molg'ollun, Corrupted Tide

Crab creature spells you cast cost {1} less to cast.
Whenever you cast a crab creature spell, create a
token that's a copy of that creature.
Crabs you control have +1/+1 and undying.
{6}{u/b}{u/b}: Create a token of each nonlegendary
nontoken crab creature you control.