Not using Contagion Engine or Contagion Clasp ? Id figure they'd be fundamantal for a counter based deck. Alibi, it doesn't do much for your infinite combos but can let you swing out.

If you get bored with this you could always use the Mycosynth Lattice , March of the Machines combo along with a bunch of Planeswalkers.

Lattice your Walkers into Artifacts. March them into creatures. Get a 1/1 counter on them somehow. Access their abilities infinitely.

Kraj is the best Planeswalker there is lol.

I personally love Freed from the Real on Kraaj and Arcanis the Omnipotent

You don't want Prime Speaker Zegana , or Craterhoof Behemoth ? But I plus one your deck.

Whoops! Prime Speaker is in there but I forgot to put her in the list!

The thing with Craterhoof Behemoth is that even though this deck runs a lot of creatures, but they are utility dudes with a target on their head, so there are generally only 3-4 out at any given time. This deck is a big more control/combo than it appears at first glance. I've run into this trap many times, including cards like that and realizing they don't help me enough to warrant inclusion, especially in the "big drop" spots.

Thanks for the +1 and the suggestions!

Well I mean you could just Tooth and Nail for Avenger of Zendikar and Craterhoof Behemoth ...

Unfortunately, the tokens created by Avenger of Zendikar don't have haste so even if I did tooth and nail for those two, I wouldn't be able to do anything with the giant tokens.

You don't attack with the tokens you use the creatures already out plus craterhoof. Do not do this cambo with no creaters out. Trust me it's a good cambo, you should try it out and if you don't like it take it out. I win a lot with this cambo tho it's very hard to stop.

Have you thought about adding more ramp and untap mechanics for infinite combos? I know it can be cheap, but people don't seem to mind when it comes to Experiment Kraj as even if you win with said combos it works in a really interesting way, if you did want to do that, then look at my deck, Infinite Combos in EDH - Experiment Kraj Budget, it is based around getting infinite Kraj combos and so far people seem to be more impressed than upset with how it works