Hidden
Does my Hidden card go straight to Trash when my last unit leaves its Battlefield?
Your last unit leaving does not immediately discard your Hidden card
RiftPal explanation · Answer first
Actually
Check when you actually lose control of the BattlefieldA Battlefield is a shared location that players compete to control during the game.View in Glossary . Your card goes to its owner’s TrashA player's off-board zone for cards that are killed or discarded and spells that finish resolving, unless an effect changes their destination. Its cards are public information and their order does not matter.View in Glossary when the applicable control check leaves you without control. The last unit leaving does not automatically send it to Trash.
RiftPal explanation
Why it matters
During a ChainAn off-board zone that holds cards and abilities during the process of playing them. Cards and abilities on it are public information.View in Glossary or an ongoing ShowdownA Showdown is a structured opportunity for players to act when a Battlefield is contested.View in Glossary or CombatCombat is the part of play where opposing players' units fight for the same Battlefield.View in Glossary there, losing your last unit does not itself remove control. Outside that contest, the normal empty-Battlefield check happens at CleanupAn automatic rules check that handles winning, lethal damage and board conditions before play continues. It is not an action you choose or normally announce, and an ordinary check does not heal units.View in Glossary with the Chain empty. Showdown and Combat also have their own control-settlement steps, so do not assume you keep control for the rest of the turn.