Sabatiel - The Philosopher's Stone (Common)

If you have a "Winged Kuriboh" monster in your GY: Pay half your LP, add 1 "Polymerization" Spell or "Fusion" Spell from your Deck to your hand. If this card is in your GY: You can banish 3 copies of "Sabatiel - The Philosopher's Stone" from your GY, then target 1 monster on the field, it gains ATK equal to the ATK of the monster on the field with the highest ATK (your choice, if tied), until the end of this turn.