Its much better to face these kinds of things, with a sense of poise and rationality. My Decks Standard
hmmm... yeah the abilities seem to match up with there being 2 planeswalkers. New sarkahn and whoever that dude in the blueish armor and the clear sky background is. My guess is a multicolor planeswalker, either UW or GW. Third instance of planeswalker must be either some sort of dedicated planeswalker removal/hindrance (seems narrow, but maybe if it was efficient enough to cast), or a card that references the card types, or permanent types.
Darn I can't find the names of the two merfolk leaders, it's somewhere in all the fluff but not in the obvious heading. It seems reasonable that one of them would be one of the other legendary creature, or maybe a Kor or an elf.