The Countdown Is at One [Unstable] SWSH147 Special Summon 1 of the

Special Summon 1 of the Fusion Materials whose name is specifically listed on that card from your GY in face-down Defense Position

it can attack an opponent's monster again in a row

If you control the monster and this card: You can send both to the GY

your opponent returns exactly 2 cards from their hand to the bottom of their Deck

" monster or 1 "Big Core" from your Deck

The Countdown Is at One [Unstable] SWSH147 Special Summon 1 of theSet: Unstable Type: Sorcery Rarity: Rare Cost: {3}{R}{R} Players play a Magic subgame, starting at 1 life and using their libraries as their decks. For the rest of the main game, if a source would deal damage to a player who didn't win the subgame, it deals double that damage to that player instead.