Treasure Panther (Maze of Muertos MZMU-EN053) - Super Rare Yu-Gi-Oh! Card

FLIP: You can send 1 Normal Monster from your Deck to the GY.
If a face-down Defense Position monster is on the field and this card is in your hand: You can Special Summon this card. You can target up to 3 face-down Defense Position monsters on the field; change them to Attack Position, then if you changed 3 monsters to Attack Position by this effect, inflict 900 damage to your opponent. You can only use each effect of "Treasure Panther" once per turn.