Winged Kuriboh Sabatiel LV10 (GMR)

You can reveal this card in your hand and pay half your LP; add 1 "Polymerization" Spell or "Fusion" Spell from your Deck to your hand, and if you do, shuffle this card into the Deck, also for the rest of this turn, you cannot Special Summon from the Extra Deck, except "HERO" monsters. During your opponent's turn, if your LP are 1000 or less (Quick Effect): You can Special Summon this card from your hand, then you can inflict damage to your opponent equal to the highest ATK among the monsters they control. You can only use each effect of "Winged Kuriboh Sabatiel LV10" once per turn.