Redemption Choir

• WOTC Official Reminder Textofficial rules
  Lifelink — Damage dealt by this creature also causes you to gain that much life.

• WWizards of the Coast2023-11-10
  Official Ruling
  You must control three or more creatures with different powers at the time the coven ability triggers and at the time the ability tries to resolve. They do not, however, need to be the same set of creatures in both cases.
• WWizards of the Coast2023-11-10
  Official Ruling
  For three creatures to have different powers from one another, each of their powers needs to be different. A 1/1 creature, a 2/1 creature, and another 2/1 creature aren't three creatures with different powers, even though both 2/1 creatures have different power than the 1/1 creature.

Rulings via Scryfall