Spell Power Mastery (SR08-EN022) - Structure Deck: Order of the Spellcasters 1st Edition Number_IGAS-EN048 Once per turn: You can

Once per turn: You can detach 1 Xyz Material from this card

Card TextIncrease the ATK of each face-up monster on the field that includes Ancient Gear in its card name by 300 points

During your Main Phase

Card TextA Beast-Type monster equipped with this card increases its ATK and DEF by 300 points

When a Spell/Trap Card or effect is activated (except during the Damage Step) (Quick Effect): You can target 1 monster your opponent controls or 1 "Harpie" monster you control

Spell Power Mastery (SR08-EN022) - Structure Deck: Order of the Spellcasters 1st Edition Number_IGAS-EN048 Once per turn: You canTypenull Normal Spell AttributeSPELL Card TextAdd 1 "Endymion" card from your Deck to your hand, then you can count the number of "Spell Power Mastery" and "Spell Power Grasp" you control and or have in your GY, and place that many Spell Counters among card(s) you control that you can place a Spell Counter on. You can only activate 1 "Spell Power Mastery" per turn.