Massive slow with - halbred/SnY + Degen aura- degen aura also can help with early kills
Follow Through- Phase/Bot + SnY/Manta - makes you one fast hero, combing that with degen makes it hard for non blink hero's to get away from you- w/ exceptions
Enemy Armor Reduction - Medallion + Cuirass (from my previous post) - Cuirass gives you and your team increased speed + enemy armor reduction
But the icing is that Omni scales well with armor and Hp. No hes not Dragon Knight or one of the others, but thats what the icing is, when you do finally get him low... Lol heal and fight continues.