Endymion, the Master Magician (Common)

You can Special Summon this card (from your hand or GY) by removing 6 Spell Counters from a "Magical Citadel of Endymion" you control. If Summoned this way: Target 1 Spell in your GY, add that target to your hand. Once per turn: You can discard 1 Spell, then target 1 card on the field, destroy that target.