Shark Rider

When Shark Rider enters the battlefield, put X 2/2 blue Shark tokens with Islandwalk into play. All lands become Islands in addition to their other types.
{8}, Exile Shark Rider: At the beginning of your upkeep, as long as Shark Rider is in exile, you may pay {3}. If you do, put 1 2/2 blue Shark token with Islandwalk into play.