Christmas Crab Migration

Create a 0/3 blue Crab creature token for each
land on the battlefield. Then create a 0/3 blue
Crab creature token for each Island on the
battlefield. Then sacrifice a creature for each
creature on the battlefield that isn't a Crab.
"There's enough moisture in the air for the large crustaceans to make the arduous, five-day journey
from their homes in wet inland forests to the Indian
Ocean, covering up to 9km along the way."
—Lindsey Galloway