Charcanis, Master of Tides

Islandwalk, vigilance
{1}{w},{t}: You gain 1 life for each Merfolk
you control.
{2}{u},{t}: Creatures you don't control get -X/-0
until end of turn, where X is the number of
Merfolk you control.
{3}{g},{t}: Create a 1/1 blue Merfolk Wizard
creature token for each nontoken Merfolk
you control.