Spellstone Sorcerer Karood [STBL-EN083] Secret Rare

Once per turn, when another Monster Card's effect is activated while there is no Spellstone Counter on this card, place 1 Spellstone Counter on this card (max. 1). This card gains 300 DEF for each Spellstone Counter on it. Once per turn, you can remove 1 Spellstone Counter from your side of the field to select 1 card in your opponent's Graveyard, and remove that card from play.