Mana Drought

Mana Drought comes into play with one
depletion counter on it.
{2}: put a depletion counter on Mana Drought.
As long as Mana Drought has any depletion
counter on it, players can't use lands as mana
sources. During any player's upkeep, that player
may sacrifice a creature to remove a depletion
counter from Mana Drought.