Endymion's Lab (Common)

This card's name becomes "Magical Citadel of Endymion" while in the Spell & Trap Zone. Each time a Spell Card is activated, place 1 Spell Counter on this card when that Spell resolves. Once per turn, after damage calculation, if your Spellcaster monster is destroyed by battle: You can remove 6 Spell Counters from your field, Special Summon 1 Level 7 or higher Spellcaster monster from your hand or Deck. You can only activate 1 "Endymion's Lab" per turn.