After you've checked out the new cards below, see our MTG Doctor Who guide for more details
Saheeli, Filigree Master Locking the cost reduction on Saheeli, Filigree Master behind this planeswalkers ultimate makes achieving it rather dicey, but the low ultimate cost makes up for it
It's basically Mana Confluence, and in many scenarios, it's even better since you can generate colorless mana without pain
This precon has the flimsiest mana base of all , with basically no attempt to do anything interesting outside of Nesting Grounds
You can do that when you need early game ramp and it can even be used for something like reanimator strategies as you can cycle it, make a token, and use that token as, say, Dread Return fodder