Two cards that might be interesting are Zada, Hedron Grinder and Magus of the Will

I would also highly recommend Erebos, God of the Dead to keep others from gaining life back. Besides it is a potential card draw if necessary.

A land to look at is Urborg, Tomb of Yawgmoth.

I generally run very few instants and sorceries in my decks so I'm not really going to be much help there.

Tree

Thanks for the comment! I really like your suggestions here - Erebos, God of the Dead is a great suggestion, I'd like to include him to pair with Greed as they are both powerful draw engines with lifegain effects.

I used to run a Zada, Hedron Grinder deck so I can attest to it's power. I'll have to think of possible cuts. I do like the idea of Magus of the Will as Past in Flames #2, I'll try to think of possible cuts for these inclusions!

I may be missing something, or maybe it's just to cast a turn 3 Licia, but I don't know if Tavern Swindler is worth it. At the same time, I really like its' inclusion, because I've seen it in a deck before.

Yeah haha, Tavern Swindler has a chance to facilitate an early Licia. Also has some synergy with Well of Lost Dreams and Alhammarret's Archive. But mostly it's just janky and comical and will occasionally do something minorly busted.

Wow, this deck idea is amazing. I'm really interested how your build developes after you take it to a few games.
On to your deck, the card that I might cut first is probably Chaplain's Blessing since it unfortunately doesn't even allow you to play your commander on turn 3. From the cards in your maybeboard I'd probably look to put one more removal (you should know best what works best in your playgroup). Another kind of "control" element could be Possibility Storm. It wrecks a lot of decks and it works quite well with extort (double the triggers) and is just stupid if you copy it during your turn with Mirage Mirror.

I forgot to mention that Sphinx-Bone Wand might be a good winning condition. If you add the Wand, I'd probably cut Dragon Mantle for another cantrip

Why no Exquisite Blood ?

Just read your description. Sorry for the suggestion.

Thanks for the comments guys!

MagicBlues I love the suggestions, this is exactly what I'm looking for, thank you for the kind words! I see where you're coming from with Chaplain's Blessing and I think you're right - it is the easiest cut in the deck right now. One removal spell that felt bad to cut was Crackling Doom, but I could also see just throwing in another board wipe, possibly Fumigate for the easy Licia follow up?

Possibility Storm seems awesome here, as does Sphinx-Bone Wand. I'm going to try to take another pass at the deck tomorrow and both cards are in consideration, I'll include any changes in the update log.