Relic Vial

• WWizards of the Coast2020-09-25
  Official Ruling
  If Relic Vial leaves the battlefield at the same time as each Cleric you control, the triggered ability triggers for any creatures you control that die at the same time (possibly including those Clerics).
• WWizards of the Coast2020-09-25
  Official Ruling
  Once Relic Vial’s ability has triggered, that ability resolves even if you no longer control a Cleric.
• WWizards of the Coast2020-09-25
  Official Ruling
  In a Two-Headed Giant game, Relic Vial’s ability causes the opposing team to lose 2 life and you to gain 1 life.
• WWizards of the Coast2020-09-25
  Official Ruling
  If you sacrifice the only Cleric you control to activate Relic Vial’s first ability, the triggered ability it gives itself triggers.

Rulings via Scryfall