Magical Citadel of Endymion

Field Spell

Each time a Spell Card is activated, place 1 Spell Counter on this card when that Spell resolves. If a card with a Spell Counter(s) is 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 a card you control, 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.

Rulings – Yugipedia

Printings:

Spellcaster's Command Structure Deck: SDSC-EN019 (Common) - 2009-03-31
OTS Tournament Pack 7: OP07-EN008 (Super Rare) - 2018-04-13
OTS Tournament Pack 7 (POR): OP07-PT008 (Super Rare) - 2018-04-13
Dark Saviors: DASA-EN055 (Secret Rare) - 2018-05-24
Structure Deck: Order of the Spellcasters: SR08-EN024 (Common) - 2019-04-19

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.26