Yes, mana leak with one land open? The point of the deck is mostly demon turn 2, poison kill turn 3 with tainted strike. It's not really supposed to be good, just fun for those "wtf" moments.
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Jarrod, it's an EDH deck. It has to be single cards. Note: Snow-Covered Lands won't work, they are the same as other basic lands in this deck.. You'll need 5 other lands which produce colorless mana ;D Now... where's the Mycosynth Lattice and draw advantage? (mines, fonts, etc)
Too high mana cost for the deck. By the time you have that mana you should be able to mill them without those.
What exactly are you trying to do with this deck? Just seems like a bunch of random cards. Make a single theme with a solid win condition.
I recently made a deck similar to this. This deck ONLY works well with two colours. I would take out white, personally, but you can take out black. You want 4 Excavators, 4 Shapeshifters, and 6 total of Clone and RIte of Replication. Sea Gate Loremaster is really good, and mind funeral is excellent, but I would also put in some control and ways to protect the Excavators. I use whispersilk, spreading seas/convincing mirage, cancel, negate and dispel. Jace Beleren and Liliana Vess are also good options in a deck like this, and I like running Time Warp, too. Hedron Crab = Bad
It's actually possible to have milled 91 cards with this deck on turn 5. Just so you know.
With the Crumbling Necropolis' getting the right colours shouldn't be too big of a deal. I like Splinter Twin more than right of replication because it's a token every turn, and I'm hoping the game will be over before I get the 9 mana to kick the replication. Although, I still need to test it out. I may take out some control or lands and put in Rite of Replication for a faster mill, if it doesn't work out as expected.
I would put in some Umbra Mystics, more auras and Day of Judgement. Then you can wipe the field of their creatures, keep your creatures, and get the auras back with Open the Vaults.