name: Drain Power
originalText: Tap all opponent's land, taking all this mana and all mana in opponent's mana pool into your mana pool. You can't tap fewer than all opponent's lands.
printings: 2ED, 30A, 3ED, 4BB, 4ED, 5ED, CED, CEI, FBB, LEA, LEB, ME4, SUM
text: Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way.