Putrefax
Vent-maw Dragon goes infinite with Aggravated Assault, that or anything with a Bear Umbra on it and/or Hellkite Charger. There's that elemental that has p/t equal to half your opponents life too. Any other sizable creature easily hits lethal if you berserk it in addition to Xenagos' ability
Best EDH commanders
Jordan Turner
Samuel Evans
>Xenagos only needs one effect, Double Strike, to instantly kill you
Uh, no? Double strike with Xenagod only deals 12. He can't pump himself, his effect specifies another target creature.
Sure, he's alright, but he's not that strong.