Field of Ruin is effectively Wasteland in this format. (Lupine Prototype took the fall first.) Trust me, you do not want it around. Falling Star is a dexterity card, so it adds nothing even if legal.
Oath of Druids at best is probably a weaker version of t1 Iona. The potentially risky option is Tolarian Academy, but given that you need cheap artifacts to make it give mana, and the good mana rocks are still banned, it should be fine.
Shahrazad's issue is that the subgame actually follows standard Magic rules, so it's really a glorified upgraded 
Flame Rift in white.