You're gonna want more lands. You have mana ramping, but it's not going to matter if you keep pulling one or two lands on your opening draw. You have an activated ability that requires black. Throw in some swamps or get rid of that guy. In fact, throw in a couple swamps, some terramorphic expanses and some black creature removal, and you'll solve a few problems. Finally, a lot of your guys are legendary. If you have any two of the same legendary creature on the board at the same time, they'll kill each other. Maybe consider some chump blockers that pull out lands when they die.
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It seems like you could make this deck Standard, if you want. E.g., grindclock could replace grindstone. Also, you have way too many mill cards. You don't need all of them, only enough to win the game. You're gonna have 3 or 4 sorceries in your hand and be a turn away from winning the game all the time. I like the concept, but I think you need to simplify what you're going for.