Looks like the set is starting to leak. The green card is Court of Abundance and reads as follows:
When Court of abundance enters the battlefield you become the monarch.
At the start of your upkeep you may put a land card from your hand onto the battlefield. If you are the monarch you may put a creature or land card from your hand onto the battlefield instead.
Seems like it is right up there with something like Oath or a one sided show and tell. If you can lotus this out turn one or some other nonsense, Monarch will draw you an extra card for your trouble as it is very hard to remove from a player in vintage (at least right now) as most people do use haste creatures to steal it. If you survive a turn you can put GB or whatever into play and go off. Even if you don't combo out it has a lot of long term value if you maintain it.