Zagana, Queen of Ile Reef

Trample
Submerge — {2}{g}{u} (You may cast this card for its Submerge cost. If you do, put it on the battlefield face down as a 1/1 creature with protection from red. Turn it face up any time it blocks or becomes blocked.)
When this card is turned face up, other merfolk get +X+X and gain trample until end of turn, where X is the number of merfolk you control.