Pay
From Archon Arcana - The KeyForge Wiki
If a player must pay Æmber to an opponent, the Æmber is removed from the paying player’s pool and added to the opponent’s pool.
—KeyForge Master Rulebook v16 November 2022
If a player must pay Æmber to an opponent, the Æmber is removed from the paying player’s pool and added to the opponent’s pool.