Emrakul, the Aeons Torn is banned in EDH =P
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Nice deck, i've also thought about making an Infect deck. I'd put in "Corpse cur" Instead of "Carrion call". And maybe put in "Unholy strength" to make it faster.
In casual play "Spawnsire of Ulamog" can use all cards you own, so you're not restricted to sideboard. You're not even restricted to the 4 card maximum rule. You can just cast 50 of the same Eldrazi card (not the legendary cards ofcourse)