Power of the Guardians (MP18-EN208) - 2018 Mega-Tins Mega Pack 1st Edition

If an attack is declared involving the equipped monster: Place 1 Spell Counter on this card. The equipped monster gains 500 ATK/DEF for each Spell Counter on this card. If the equipped monster would be destroyed by battle or card effect, you can remove 1 Spell Counter from your field, instead.