Black Hole

Choose X permanents, exile them randomly in a
pile face-down. Put Black Hole on top of the pile
with X Gravity counters on it.
During each player's upkeep that player loses
life equal to the number of Gravity counters on
Black Hole.
During each player's draw step that player may sacrifice a land, draw the top card under Black
Hole and remove a Gravity counter from it.