Mathematician (Blue) [DLCS-EN025] Ultra Rare Gold Series 2008 follow its card text as

follow its card text as if you had used it yourself

Set: Breakers of Shadow Card type: Normal Trap Rarity: Ultra Rare When an opponent's monster declares an attack: Change all Attack Position monsters your opponent controls to face-down Defense Position

Set: Breakers of Shadow Card type: Effect Monster Rarity: Rare Attack: 3300 Defense: 2600 You can Special Summon this card (from your hand) to your opponent's side of the field in Attack Position

with Innistrad: Double Feature

Mathematician (Blue) [DLCS-EN025] Ultra Rare Gold Series 2008 follow its card text asSet: Dragons of Legend: The Complete Series Card type: Effect Monster Rarity: Ultra 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 GY. When this card is destroyed by battle and sent to the GY: You can draw 1 card.