Fiendsmith's Agnumday [MP25-EN109] Prismatic Secret Rare

2+ monsters, including a LIGHT Fiend monster Once per turn (Quick Effect): You can target 1 LIGHT non-Link Fiend monster in your GY; Special Summon it, and if you do, equip this card you control to that monster as an Equip Spell with the following effects. • The equipped monster gains ATK equal to the total Link Rating of Link Monsters equipped to it x 600. • If the equipped monster attacks a Defense Position monster, inflict piercing battle damage to your opponent.