Endymion, the Mighty Master of Magic

Ability: Pendulum Effect

You can remove 6 Spell Counters from your field; Special Summon this card from the Pendulum Zone, then count the number of cards you control that can have a Spell Counter, destroy up to that many cards on the field, and if you do, place Spell Counters on this card equal to the number of cards destroyed.

Spellcaster/Pendulum/Effect • 250

When a Spell/Trap Card or effect is activated (Quick Effect): You can return 1 card you control with a Spell Counter to the hand, and if you do, negate the activation, and if you do that, destroy it. While this card has a Spell Counter, your opponent cannot target it with card effects, also it cannot be destroyed by your opponent's card effects.