Apprentice Illusion Magician

“You can Special Summon this card (from your hand) by discarding 1 card. If this card is Normal or Special Summoned: You can add 1 "Dark Magician" from your Deck to your hand. During damage calculation, if your other DARK Spellcaster monster battles an opponent's monster (Quick Effect): You can send this card from your hand or face-up field to the GY; that monster you control gains 2000 ATK/DEF during that damage calculation only.”