You may play land cards from your graveyard.
7/14/2017 Ramunap Excavator doesn’t change the times when you can play those land cards. You can still play only one land per turn, and only during your main phase when you have priority and the stack is empty.
7/14/2017 Ramunap Excavator doesn’t allow you to activate activated abilities (such as cycling) of land cards in your graveyard.
I WANT 5
I was hoping for a green ruin ghost, but this is awesome! Finally making lands relevant to green!