They stay in your sideboard until you grab them with a learn effect, or another kind of card that could look for them outside the game
When you start getting low, crew this spooky car up with 2 power and swing hard
This Bloomburrow Animated Army Commander Deck includes 1 deck of 100 Magic cards (3 Traditional Foil cards, 97 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-border card of rarity Rare or higher and 1 Traditional Foil Uncommon card), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 strategy insert, and 1 reference card.
Theyre only considered to be permanents while on the battlefield and are referred to as permanent cards when theyre elsewhere, like in the effect of Aether Helix
Trading Card Games (TCGs): Think Pokmon, One Piece, Magic: The Gathering, Yu-Gi-Oh
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Cat you control may become lethal if Feline Sovereign leaves the battlefield during that turn
