Master of the Pearl Trident

Other Merfolk creatures you control get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

"Let the land dwellers know the coast is no longer the border between our realms. A new age of empire has begun."

The Lost Caverns of Ixalan Commander

Jumpstart: Historic Horizons

Time Spiral Remastered

Duel Decks: Merfolk vs. Goblins

Magic 2013

Other Merfolk creatures you control get +1/+1 and have islandwalk. (They are unblockable as long as defending player controls an Island.)

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.