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.
(04/10/2004)
This card forces the target player to draw mana from lands if they are untapped, but that player can choose how to draw the mana if a land they control has multiple mana abilities, or mana abilities with choices.
(15/04/2013)
A mana ability is an ability that (1) isn't a loyalty ability, (2) doesn't target, and (3) could add mana when it resolves.
(04/10/2004)
If a land can draw a variable amount of mana, the target player (not the player of this spell) chooses how much to draw.
(04/10/2004)
Your opponent may use instants and abilities of permanents in response to this spell before you get the mana.
