Storming Tide-Flyer

Flying
Submerge — {1}{u/r}(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, it deals X damage to target creature or planeswalker, where X is the numer of submerged creatures you control.