Nightmare [Beta Edition] Shapeshifter Spirit Set: Dark Revelation Volume 1

Set: Dark Revelation Volume 1 Card type: Fusion/Effect Monster Rarity: Rare Attack: 2200 Defense: 1900 "X-Head Cannon" + "Y-Dragon Head" This card cannot be Special Summoned except by removing from play the above cards on your side of the field then you can Special Summon this card from your Fusion Deck (You do not use 'Polymerization')

you can remove from play 1 DARK monster from your Graveyard to Special Summon 1 DARK monster from your Graveyard

and they're getting even more cards in October's core booster set

Set: Battles of Legend: Armageddon Card type: Normal Spell Rarity: Secret Rare Target 1 "Fossil" Fusion Monster you control

Your blood will oil the gears

Nightmare [Beta Edition] Shapeshifter Spirit Set: Dark Revelation Volume 1Set: Beta Edition Type: Creature Nightmare Horse Rarity: Rare Cost: {5}{B} Flying (This creature can't be blocked except by creatures with flying or reach.) Nightmare's power and toughness are each equal to the number of Swamps you control. The Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.