I have an Abzan life gain deck. These are some cards from it that might be worth a spot in your Esper strategy.

Essence Pulse, Kaya's Wrath, Kambal, Consul of Allocation, Divine Offering, Serene Offering, Shambling Vent, Aetherflux Reservoir, Alhammarret's Archive, Blighted Steppe

Some changes im thinking about

switching out Blighted Steppe, Shambling Vent and Vault of the Archangel for Maze of Ith, Mystifying Maze and Reliquary Tower

Monologue Tax for Dark Tutelage

Words of Worship for Venser's Journal

and Brainstorm for Counterspell

overall these would lean the deck further into control and with the amount of card draw adds some needed increased hand size options

thoughts?

You could even run Dark Confidant over Dark Tutelage.

Absorb worth a spot?

Test out those lands. I think Shambling Vent should stay in over Maze of Ith because it feeds the life gain theme and it adds 2 out of 3 colored mana while Maze adds 0.

TheOfficialCreator

Dark Confidant would be an interesting choice, there is already quite a few card draw enchantments so moving the card draw onto a creature would spread and balance the deck better I think but I feel like people run more creature removal in general (at least my friends do) so it may just be an easy target. Although it is mana cheaper to cast . . . I'll have to think about this one some more but good suggestion!

SufferFromEDHD

I see what your saying about Shambling Vent and Maze of Ith and I think you are probably right, and if Mystifying Maze ends up being too slow for what we need it for we can swap it with Maze of Ith, losing out on the mana sucks but if prevents being rushed down then its worth it I say. Running Absorb instead of Counterspell would be cool but its a matter of playing around and seeing if we can afford leaving the additional mana up to cast, if we can get away with it then I don't see why not!

Thanks for the suggestions! Continue to leave more if you think of them