{Exava, Rakdos Blood Witch} + {Cathars' Crusade}
3 colors and high mana curve, the idea is good but hard do put in practice x.x
It's a good 5 drop choice for aristocrats maybe?
{fervor} gives all your creatures haste :P
I'd rather have a more useable card in play, fervor is really only helping if you just played them, crusade helps all game long
{anger} or {concordant crossroads}