i really like this deck, i may even build it myself

Arcane Lighthouse maybe

Fountain Watch is defiantly good in here

Greater Auramancy maybe

Hanna's Custody

Spectral Guardian

Spiritual Asylum

True Believer

Ivory Mask

Darksteel Forge

Elspeth, Knight-Errant

Armageddon

Scrying Sheets

Ancient Tomb

Dark Depths maybe

Halls of Mist maybe

Icatian Store actually might be ok in this deck since you wont untap your lands of ten anyways

Kor Haven

Maze of Ith

Nykthos, Shrine to Nyx actually good since you can only untap so many

Serra's Sanctum pricey but ok

The Tabernacle at Pendrell Vale good but i dont know the price of it

Thespian's Stage / Vesuva to copy those good lands

Westvale Abbey  ^Flip

most of the cards ive suggested are mostly maybie but who knows im sure suggesting them wont hurt

Karn Liberated could be an excellent win con

Relic of Progenitus

Scroll Rack / Sensei's Divining Top

Thought Vessel

Ugin, the Spirit Dragon

Worn Powerstone

Ajani, Caller of the Pride ult ability

Ajani Steadfast ult ability

Blinding Angel

Catastrophe

Island Sanctuary

Phyrexian Rebirth

Storm Herd

Wrath of God

authority of consulate is a new card coming out that definitely works with this deck