If a cost or effect allows a player to pay an amount of life greater than 0, the player may do so only if their life total is greater than or equal to the amount of the payment. If a player pays life, the payment is subtracted from their life total; in other words, the player loses that much life.
July 12, 2019 · Core Set 2020
If a cost or effect allows a player to pay an amount of life greater than 0, the player may do so only if their life total is greater than or equal to the amount of the payment. If a player pays life, the payment is subtracted from their life total; in other words, the player loses that much life. (Players can always pay 0 life.)
July 16, 2010 · Magic 2011
Damage is processed in a three-part sequence.
February 1, 2010 · Worldwake
A player who attempts to draw a card from an empty library loses the game the next time a player would receive priority. (This is a state-based action. See rule 704.)