If an effect would add mana represented by a generic mana symbol to a player’s mana pool, that much colorless mana is added to that player’s mana pool.
January 25, 2019 · Ravnica Allegiance
If an effect would add mana represented by a generic mana symbol to a player's mana pool, that much colorless mana is added to that player's mana pool.
January 16, 2016 · Oath of the Gatewatch
If an effect would add mana represented by a generic mana symbol to a player’s mana pool, that much colorless mana is added to that player’s mana pool.
May 1, 2014 · Journey into Nyx
To “tap a permanent for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”
September 30, 2011 · Innistrad
To "tap a permanent for mana" is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, "Mana Abilities."
June 17, 2011 · Commander 2011
To “tap a permanent for mana” is to activate a mana ability of that permanent that includes the
May 1, 2011 · New Phyrexia
To "tap a permanent for mana" is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, "Mana Abilities."
April 1, 2011 · Duel Decks: Knights vs. Dragons
One card (Drain Power) puts all mana from one player's mana pool into another player's mana pool. (Note that these may be the same player.) This empties the former player's mana pool and causes the mana emptied this way to be put into the latter player's mana pool. Which permanents, spells, and/or abilities produced that mana are unchanged, as are any restrictions or additional effects associated with any of that mana.
February 4, 2011 · Mirrodin Besieged
One card (Drain Power) puts all mana from one player’s mana pool into another player’s mana pool. (Note that these may be the same player.) This empties the former player’s mana pool and causes the mana emptied this way to be put into the latter player’s mana pool. Which permanents, spells, and/or abilities produced that mana are unchanged, as are any restrictions or additional effects associated with any of that mana.
October 1, 2010 · Scars of Mirrodin
One card (Drain Power) puts all mana from one player’s mana pool into another player’s mana
July 16, 2010 · Magic 2011
One card (Drain Power) puts all mana from one player's mana pool into another player's mana pool. (Note that these may be the same player.) This empties the former player's mana pool and causes the mana emptied this way to be put into the latter player's mana pool. Which permanents, spells, and/or abilities produced that mana are unchanged, as are any restrictions or additional effects associated with any of that mana.