Primeval titan would get rid of some of the mana producers and even though its a decent mana ramp the ways of getting out the edrazi tend to be the summoning traps. Honestly i have tried it with proms but i found this works better. as for khalni it requires 2 turns realistically to crack and is good later game but in the crucial first 3 turns its to slow.
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you know Chris we need to talk about this friday C.J.
Nice deck, remindes me of Duke Reid's in the mtg world championship 2014
The thing I see wrong with this deck is that even though you have fetch cards for a prismatic omen and scapeshift to get those out is going to take way to long