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This is a grixis eldrazi deck, it's basically you try to kill everything at once with kozilek's return and radiant flames. If he plays esper dragon, take off radiant flames and horribly awry and put in foul-tongue invocation. If he delves a lot put in ulamog's nullifier because it can't be dispelled or negated so it 's good against control decks as most use dig through time. I feel the main deck can deal with atarka red, and blue-red prowess red pretty well because of all the ways to deal damage to everything.
Try to keep a way to protect your silumgar when you cast him but not for the big eldrazi because their effects still work. Destroy the board and cast big stuff. This deck is a bit like a modern jund deck, in the sense that you exhaust the opponents ressources before attacking with too much pressure for the opponent to handle.
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