Magical Citadel of Endymion (SDSC-EN019) - Structure Deck: Spellcaster's Command Unlimited

Each time you or your opponent activates a Spell Card, place 1 Spell Counter on this card. If a card with a Spell Counters(s) on it is destroyed, place a number of Spell Counters on this card equal to the number of Spell Counters that were on the destroyed, place its Spell Counters on this card. Once per turn, if you would activate a card effect by removing a Spell Counter(s) from your side of the field, you can remove that many Spell Counters from this card instead. If this card would be destroyed, you can remove 1 Spell Counter from this card instead.