In a multiplayer game using the shared team turns option, teams rather than individual players have priority. See rule 805, “Shared Team Turns Option.”
October 5, 2018 · Guilds of Ravnica
Some objects have no mana cost. This represents an unpayable cost. An ability can also have an unpayable cost if its cost is based on the mana cost of an object with no mana cost. Attempting to cast a spell or activate an ability that has an unpayable cost is a legal action. However, attempting to pay an unpayable cost is an illegal action.
September 30, 2011 · Innistrad
Some mana costs contain no mana symbols. This represents an unpayable cost. An ability can also have an unpayable cost if its cost is based on the mana cost of an object with no mana cost. Attempting to cast a spell or activate an ability that has an unpayable cost is a legal action. However, attempting to pay an unpayable cost is an illegal action.
June 17, 2011 · Commander 2011
Some mana costs contain no mana symbols. This represents an unpayable cost. An ability can
February 4, 2011 · Mirrodin Besieged
Some mana costs contain no mana symbols. This represents an unpayable cost. An ability can also have an unpayable cost if its cost is based on the mana cost of an object with no mana cost. Attempting to cast a spell or activate an ability that has an unpayable cost is a legal action. However, attempting to pay an unpayable cost is an illegal action.
October 1, 2010 · Scars of Mirrodin
Some mana costs contain no mana symbols. This represents an unpayable cost. An ability can
July 16, 2010 · Magic 2011
Some mana costs contain no mana symbols. This represents an unpayable cost. An ability can also have an unpayable cost if its cost is based on the mana cost of an object with no mana cost. Attempting to cast a spell or activate an ability that has an unpayable cost is a legal action. However, attempting to pay an unpayable cost is an illegal action.
February 1, 2010 · Worldwake
If a player has 0 or less life, that player loses the game as a state-based action. See rule 704.