damage yugioh card Yu-Gi-Oh! - Translation (ANPR-EN071) - Ancient Prophecy - Unlimited Edition Damage Eater | Card Details

Is it for a sports team that's bad

If your commander is something like Emry, Lurker of the Loch, you can pitch your hand to Lions Eye Diamond, take the three blue mana to cast Emry, and then on a later turn use her to recover the Lions Eye Diamond plus any other artifacts you pitched

Although the word "Nightmare" brings about unsettling implications that match with Honchkrow's Dark-type, the addition of the word Mambo is a little unusual considering it is defined as being a type of dance

If you control an "Ultimate Crystal" monster, you can activate 1 or 2 of these effects in sequence, instead (and do not have to reveal a monster)