Master of the Pearl Trident
From The Lost Caverns of Ixalan Commander set
Master of the Pearl Trident
Creature — Merfolk
2/2
Other Merfolk creatures you control get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
Rulings
- Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Merfolk you control may become lethal if Master of the Pearl Trident leaves the battlefield during that turn.