Aquaman

Vigilance
When Aquaman attacks, all krakens, leviathans, serpents, octopuses, and merfolk you control get
+2/+2 and trample until end of combat.
{2}{u}{g}: Give all krakens, leviathans, serpents,
and octopi you control a +1/+1 counter, then
create a 1/1 blue merfolk creature token for each
+1/+1 counter put on a creature you control.
(You may only activate this ability as a sorcery.)