Blast Magician (SDSC-EN014) - Structure Deck: Spellcaster's Command 1st Edition

Each time you or your opponent activates 1 Spell Card, put 1 Spell Counter on this card. By removing any number of Spell Counters, destroy 1 face-up monster on the field with ATK equal to or less than 700 x the number of removed Spell Counters.