I must compliment SP on making this event, a nice change from the regular pace of wars. Although it would have been nice if they had rune experience at the same time. Epics who otherwise are discarded easily may now have a chance to shine.
Some excellent epics for these rules, just to list a few:
Nautilus: since he is still not fixed he can possibly wipe an entire team if he carries strength. And there are only a few freeze immune epics.
Ophiuchus: There are, I believe, no possess immune epics, and there is no bulwark or tough in play. So his 2 turn possession will almost be an instant match winner, unless he faces a team of three artifacts.
Volray: Perfectly capable of wiping out an entire enemy team with 'infinity voltage' if he is runed properly.
Sweeperion: He cannot be denied. He can remove any negative effects from his allies. Just pair him with a slower Ophiuchus, Nautilus or Volray, remove anything that hit them and you are done. Extra bonus: only gets critical from magic.
Avaast: He has a multi freeze. Very good for opening denial (though not against Ledo).
Ledovech: A freeze and stun machine (if you give him the right skills). Unfortunately no group denial.
Furrhem: A more versatile version of Ledovech. Immune to stun instead of freeze.
Dragonian Beast: He has an AOE stun. Which makes him a good candidate for any team in these rules. Unfortunately he has a very low natural speed.
Support and Disruption:
If you have any of the game winners you may not need any other support than a team speed slave, but:
Inknatius: He cannot be denied, he hits hard and he has a multi blind.
Wolff'tagnan: Double damage for the entire ally team and clearing debuffs is just very, very nasty. Only gets critical damage from one element.
Esthirel: Clear negative effects, burn, blind, give double damage, there is not much she cannot do.
Skeel Trooper: AOE burn, blind and poison. Give him 2 turns and the enemy will be wiped.
I-Pug: Hits hard, can poison, gives stamina leak. And a nasty special on defence, garantueed to take out one enemy,