[Xyz/ Rank 5/ DARK/ Fiend/ ATK : 2300/ DEF: 1300]
2 Level 5 Fiend-Type monsters
When this card is Xyz Summoned ; you can add 1 banished Fiend-Type monster to your hand. Once during either player's Battle Phase : you can detach 1 Xyz Material from this card ; all "Dark World" monsters you control gain ATK equal to the number of "Dark World" cards in your graveyard x 100 until the End Phase. When this card is destroyed : return 2 "Dark World" monsters to your Deck ; discard 1 card from your hand. The discarded card is treated as being discarded by your Opponent's card effect.
I posted it for a contest and got 2nd place
