If an effect would add mana represented by a Phyrexian mana symbol to a player’s mana pool, one mana of the color of that symbol is added to that player’s mana pool.
January 25, 2019 · Ravnica Allegiance
If an effect would add mana represented by a Phyrexian mana symbol to a player's mana pool, one mana of the color of that symbol is added to that player's mana pool.
February 1, 2014 · Born of the Gods
If an effect would add mana represented by a Phyrexian mana symbol to a player’s mana pool, one mana of the color of that symbol is added to that player’s mana pool.
September 30, 2011 · Innistrad
If an effect would add mana represented by a Phyrexian mana symbol to a player's mana pool, one mana of the color of that symbol is added to that player's mana pool.
June 17, 2011 · Commander 2011
If an effect would add mana represented by a Phyrexian mana symbol to a player’s mana pool,
May 1, 2011 · New Phyrexia
If an effect would add mana represented by a Phyrexian mana symbol to a player's mana pool, one mana of the color of that symbol is added to that player's mana pool.
April 1, 2011 · Duel Decks: Knights vs. Dragons
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."
February 4, 2011 · Mirrodin Besieged
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.”
October 1, 2010 · Scars of Mirrodin
To “tap a permanent for mana” is to activate a mana ability of that permanent that includes the
February 1, 2010 · Worldwake
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."