戦場だってステージ ありや is a Weiß Schwarz card from D_CIDE TRAUMEREI DCT/S86-007. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this card is placed on the stage from your hand, you may put the top card of your clock into your waiting room. 【AUTO】 [(1) Put 1 card from your hand into your waiting room] When this card attacks, you may pay the cost. If you do, this card gets +2000 power and the following ability until end of turn. "【AUTO】 When this card's battle opponent becomes 【REVERSE】, you may deal 1 damage to your opponent." (Damage may be canceled)