Giant Shark

This creature can't attack unless defending player controls an Island. Whenever this creature blocks or becomes blocked by a creature that has been dealt damage this turn, this creature gets +2/+0 and gains trample until end of turn. When you control no Islands, sacrifice this creature.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ob5ea7j1dpb1hj195ew70.