Rootmolder Spasm

Target player reveals cards from the top of their library until they reveal X land cards, then puts
all cards revealed this way into their graveyard.
If X is greater than the number lands you
control, put a number of land cards equal to the
difference from among the milled cards onto the battlefield under you control. X can't be 0.
Flashback—{b}{b}{g}{g}, Exile X land cards from
your graveyard.