chirz2792 Deckling

Torpor Orb, Hushwing Gryff, and Tocatli Honor Guard will shut off the enter trigger. Rootborn Defenses and Avacyn, Angel of Hope will protect your stuff. Mesmeric Orb might also give him a headache but I'd recommend one of the others cards first. You could also just convince the table to gang up on him and try to take him out of the game before he can cast zacama. Probably won't be a lot of fun for him though.

Deck looks pretty cool. Is Impending Disaster meant to be something else?

Have you thought about Helm of the Host to drain a bunch of life with each land drop? Sweet deck btw.

You discard when the creatures enter the battlefield. Other ways to discard: Liliana, Defiant Necromancer, Liliana Vess, Faithless Looting, Tormenting Voice, Cathartic Reunion, Daretti, Scrap Savant, Sarkhan, Fireblood, Jaya Ballard, Sire Of Insanity, Mindslicer, Cunning Lethemancer, Anvil of Bogardan, Necrogen Mists, and Liliana of the Veil to name a few. Just search discard on gatherer.

I've thought about it. I'm not sure but I'll give it a shot when I find room.

Animar is going to paint a big target on your head. I'd go with Samut or Surrak. Both of them would be good, just depends on the colors you want.

A few years ago I was playing with my brother and my friend. I was on The Mimeoplasm, my brother was on Brago, King Eternal, and my friend was on Lazav, Dimir Mastermind. 3 control decks caused the game to go for almost 3 hours. Cyclonic Rift was cast 5 times and the Lazav deck ran out of his 20+ counterspells. He ended up winning by playing out Mesmeric Orb and then playing Copy Artifact and Clever Impersonator to mill us all out. It sounds boring but it was hilarious.

Personally I'd go for Olivia or Malfegor. Garna's ability seems a little harder to build around.

Malfegor is definitely pretty solid for a deck like this. I used to run him and his enter trigger is brutal. You could also try Olivia, Mobilized for War. Neheb, the Worthy lets you discard when you deal combat damage. You could also try Xantcha, Sleeper Agent as a way to refill your hand so you have cards to discard. Last suggestion is Garna, the Bloodflame to get all the stuff you discarded back.