Polukranos, World Eater and Bonfire of the Damned comes to mind for clearing the board efficiently. +1 for the Gruul love :)

Also with such a top heavy curve, things like Karametra's Acolyte, Fyndhorn Elder, Nykthos, Shrine to Nyx and Greenweaver Druid goes a long way.

Sorry for the triple posts, but I got into breaking down your deck more. Cards to consider:

• Gruul Signet
• Sol Ring
• Emerald Medallion

Too slow cards to cut to make room for more acceleration:

• Zendikar's Roil
• Warstorm Surge
• Goblin Bombardment Does too little in EDH
• Barrage of Expendables Does too little in EDH
• Magmaw Does too little in EDH
• Rishkar's Expertise Your hich curve makes sure this is not needed

To name a few. It's ofc all up to you, but like this you'll get stuck with stompers in hand without means to cast them against faster decks.

I appreciate the tips you gave me. As for the cards such as Goblin Bombardment and Barrage of Expendables. I use them more as a sacrafice outlet and they came in really handy. I do agree with you that my curve is rather high and have had some games that i was doing nothing untill i had my Omnath, Locus of Rage on the battlefield. After that i started destroying players. Im going to add some of the cards you considerd and see if it helps my early game state. Thanks you for your help :)

You already have a lot of sac outlets for a deck that's not primarily focused on it and those two don't really have that much benefits. As you have superior outlets like Life's Legacy, Momentous Fall, Soulblast, Descent of the Dragons or Perilous Forays which should be plenty for your needs. I'd cut those for 2 I mentioned for some ramp to get your fatties out more consistently.

This version of the deck is a little outdated too. So some of these cards arent in there anymore and got changed for others. I will update the deck later today. Though i will give your tips a try and see if it works better for me or not :)