Yenkas's Lamentable Luck

Upon seeing the result of a skill check, saving throw, or roll to determine the amount of Hit Points one of your spells or abilities would heal, you may use your reaction to reroll the result with this spell. If you do so, your next two attack rolls have disadvantage.

At Higher Levels. If you cast this spell at third level or higher, you may also add 1 to the skill check or saving throw, or treat the amount of Hit Points healed as the maximum possible for that spell or ability.