Violeta, Harmonic Attunement

As Violeta enters, choose odd or even.

If a source an opponent controls would cause you
to lose an amount of life that’s not of the chosen
quality, it causes you to lose that much life minus
1 instead. (Damage causes loss of life.)

If a source you control would cause an opponent
to lose an amount of life that’s not of the chosen
quality, it causes that player to lose that much life
plus 1 instead.