Tithe Drinker

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

• WWizards of the Coast2024-01-12
  Official Ruling
  The extort ability resolves before the spell that caused it to trigger. The ability resolves even if that spell is countered.
• WWizards of the Coast2024-01-12
  Official Ruling
  You may pay a maximum of one time for each extort triggered ability. You decide whether to pay when the ability resolves.
• WWizards of the Coast2024-01-12
  Official Ruling
  The amount of life you gain from extort is based on the total amount of life lost, not necessarily the number of opponents you have. For example, if your opponent's life total can't change (perhaps because that player controls Platinum Emperion), you won't gain any life.
• WWizards of the Coast2024-01-12
  Official Ruling
  The extort ability doesn't target any player.

Rulings via Scryfall