Looks solid! You could try taking a look at Garruk, Primal Hunter for some draw power.
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Thanks for the advice! I agree with you on Dralnu. Still working on putting this together and I'd like to keep it relatively cheap until my Standard and Legacy decks are done; but once those are settled in I'll definitely grab Urborg, Tomb of Yawgmoth and Cabal Coffers.
As a sideboard option, I've found Judge's Familiar to be excellent.
Adding another Restoration Angel would be optimal. Temple Gardens will be something to consider as well, you'll certainly gain enough life from Thragtusk, and even more if you include Centaur Healer, to offset the 2 life you will lose. Armada Wurm is another option, he will just become overwhelming to your opponent if you kept flickering him for more tokens. But I think your deck is extremely solid the way it is with tons of flicker options from destroying the enemies land to generating more tokens.
The mortarpod is a very versatile artifact, but it is indeed mainly for standard. Its ability to be dropped for 2 mana then sac'd to deal 1 damage to a Snap Caster, Delver of Secrets, Dark Confidants, etc, makes it a great removal tool. Its true potential shines when combined with a Gravecrawler and a Blood Artist. -Sac Germ Token, 1 life gained, 2 life lost to opponent -Attach Mortarpod to Gravecrawler, sac it, 1 life gained, 2 lost to opponent -Re-cast Gravecrawler This combo nets me 2 life gain and 4 life lost to the opponent. You can also combo the mortarpod with Geralf's Messenger; gaining 1 life, dealing 5 damage to your opponent and having a 4/3 put on the field (Assuming a Blood Artist is down). The combo is really a mid-game / late game answer for getting around tough situations where my fast zombies lose their steam. But as I said before, I primarily use him for sniping creatures, I see a lot of Delver decks in my local meta.