Text (ET): 2/2, Wither. ; Whenever ~this~ deals damage to a player, that player can't gain life for the rest of the game.
The player can't gain life for the rest of the game, even if this card leaves play before then. [Eventide FAQ 2008/07/08]
Once the "no life gain" is in effect, spells and abilities that would cause a player to gain life resolve normally, but the life gain portion of the effect is ignored. [Eventide FAQ 2008/07/08]
Once the "no life gain" is in effect, effects that try to replace life gain with something else do not work because the life gain can't happen. [Eventide FAQ 2008/07/08]
Once the "no life gain" is in effect, effects that try to set the player's life total to a value higher than the current value are ignored. If it tries to set to a lower value, it works normally. [Eventide FAQ 2008/07/08]
Once the "no life gain" is in effect, any cost that includes life gain cannot be paid. [Eventide FAQ 2008/07/08]