How does Ember Monk's triggered ability resolve in a chain when it's targeted by Void Seeker and the player reacts with Hidden Card (Teemo Scout)?

Ruling: Ember Monk's triggered ability gets added to the chain as pending immediately after the correct event happens, and finalizes at the next available cleanup. There can only be one chain at once, not a new chain.

Sequence:

• Void Seeker is played targeting Ember Monk
• Player reacts with Hidden Card (Teemo Scout)
• Cleanup happens immediately after Teemo is played
• Ember Monk's trigger finalizes and is added to the chain
• Chain is now: Void Seeker -> Ember Monk trigger
• Chain resolves FILO (First In, Last Out): Ember Monk trigger resolves first, then Void Seeker

Nuances:

• The judge's ruling that Ember Monk would die before a new chain could open was incorrect
• In a related scenario with Hextech Rey dealing 3 damage to Ember Monk, if opponent plays another Hextech Rey and player reacts with Hidden Card, but opponent reacts to Hidden Card with Stupify, the Monk dies before getting extra Might because Stupify resolves before the Hidden Card
• The opponent could also let the Hidden Card resolve and react with Stupify before Ember Monk's trigger resolves