Kochobo's Hinamatsuri (INFO-EN087) [The Infinite Forbidden]

If this card is in your hand or GY: You can target 1 Machine monster on the field; for the rest of this turn, you cannot Special Summon from the Extra Deck, except Xyz Monsters, also Special Summon this card (but banish it when it leaves the field), and if you do, halve that monster's ATK, also this card's Level becomes that monster's. You can only use this effect of "Kochobo's Hinamatsuri" once per turn.