Tibalt, Rakish Instigator

Legendary Planeswalker — Tibalt

Your opponents can't gain life.
: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."

2019-05-03:
If an effect says to set an opponent’s life total to a number that’s higher than their current life total while Tibalt is on the battlefield, the player’s life total doesn’t change.
2019-05-03:
Spells and abilities that cause opponents to gain life still resolve while Tibalt is on the battlefield. No opponent will gain life, but any other effects of that spell or ability will happen.