Every distinct wording since 2010, newest first.
July 12, 2019 · Core Set 2020
Paying mana is done by removing the indicated mana from a player’s mana pool. (Players can always pay 0 mana.) If excess mana remains in that player’s mana pool after making that payment, the player announces what mana is still there.
February 1, 2010 · Worldwake
Damage dealt to a player causes that player to lose that much life.