Given this is a Voltron deck, I'd recommend Blood Mist or Duelist's Heritage over Berserkers' Onslaught. You only need to buff the one creature the majority of the time, and these'll help lower your curve a bunch. Being able to give Zurgo double strike the turn you play him is pretty good.

I'm also curious as to what Glory of Warfare and the like are doing in this deck. They don't really make much sense if you aren't going wide, which given you're a Voltron deck, you probably won't be doing most games. I'd recommend whittling down your token support in favor of some more reliable lifelink for Zurgo (Who needs defense with that lifegain train?) and perhaps a Marchesa's Decree and the like. Maybe even some of those "Whenever another player attacks this player" curses like Curse of Shallow Graves.

I'd also recommend Burning Anger, as it synergizes well with Zurgo's Sengir ability, plus it allows you to keep him tapped if you don't feel like attacking that turn... for whatever reason.

The5lacker Thanks for the suggestion! I'll definitely side board it!