Cosmo Brain [MP19-EN089] Common Rex if this card attack a

if this card attack a face-down Defense Position monster

This card returns to the top of your Deck

your opponent can send 1 card with that monster's name from their Deck or Extra Deck to the GY to negate this effect

or 10 DARK Xyz Monster you control with 2 or more Xyz Materials as the Xyz Material

Cosmo Brain [MP19-EN089] Common Rex if this card attack aSet: 2019 Gold Sarcophagus Tin Mega Pack Card type: Effect Monster Rarity: Common Attack: 1500 Defense: 2450 Cannot be Normal Summoned Set. Must first be Special Summoned by sending 1 non Effect Monster from your hand or face up field to the GY. This card gains ATK equal to the Level of the monster sent to the GY this way x 200. You can Tribute 1 Effect Monster; Special Summon 1 Normal Monster from your hand or Deck. You can only use this effect of