Karkinos, Crab King

Whenever Karkinos, Crab King or another Crab
creature enters the battlefield under your
control, you may draw two cards, then target
opponent puts the top three cards of their
library into their graveyard.
{g}{u}{3}: Each creature gains islandwalk and
assigns combat damage equal to its
toughness rather than its power until the
end of the turn.