Aria chantematin

If an effect says to set a player's life total to a number that's higher than the player's current life total while Mornsong Aria is on the battlefield, the player's life total doesn't change.

Spells and abilities that cause players to draw cards or gain life still resolve while Mornsong Aria is on the battlefield. No player will draw cards or gain life, but any other effects of that spell or ability will still happen.