Yeah, I'd get more mana accel. Also, you might need some bigger finishers (think big trampler, or overrun). I think the rings are too slow and maybe increase your lands or get some Borderland Rangers to keep up your mana tempo. Revive seems like a useless filler. -Rings, Revive, other fillers +Ramp cards, lands/land fetchers, finishers
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I like it. Boundless Realms is just overkill. Toss out some of your filler mill like the curse and dream twist. You don't have enough creatures in the deck to make Undead Alchemist very strong. Instead focus more on stall cards like Fog or defensive creatures like Fog Bank. Maybe a few more lands, because you want to keep up your mana tempo as well as accelerating; Borderland Ranger might help.
Doubling Season; Mitotic Slime; Feed the Pack; Gutter Grime; Mikaeus, the Unhallowed