Sea-Guard Cetacean

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever a source deals damage to Sea-Guard Cetacean, that source's controller puts that many
cards from the top of their library into their graveyard.
A cetacean's memory is as vast as the ocean. They remember every tide, every island, and every ship that
has traveled their domain, or failed to do so.