Mathematician [DRLG-EN023] Secret Rare BT10-055 Set: XY: Evolutions Type: Psychic

Set: XY: Evolutions Type: Psychic Rarity: Uncommon Retreat cost: Colorless

when a card(s) you control is destroyed by a Spell effect (except during the Damage Step): You can banish this card from your Graveyard

then you can Special Summon 1 "Black-Winged Dragon" from your Extra Deck

and proceed to damage calculation

Sorcery (6)

Mathematician [DRLG-EN023] Secret Rare BT10-055 Set: XY: Evolutions Type: PsychicSet: Dragons of Legend Card type: Effect Monster Rarity: Secret Rare Attack: 1500 Defense: 500 When this card is Normal Summoned: You can send 1 Level 4 or lower monster from your Deck to the Graveyard. When this card is destroyed by battle and sent to the Graveyard: You can draw 1 card.