Red-eyes B. Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Bolt Penguin → Twin-headed Thunder Dragon

Red-eyes B. Dragon + The Immortal of Thunder → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Electric Snake → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Electric Lizard → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Meteor Dragon → Meteor B. Dragon

Castle of Dark Illusions + Job-change Mirror → Summoned Skull

Castle of Dark Illusions + Yamatano Dragon Scroll → Blackland Fire Dragon

Castle of Dark Illusions + Dragon Statue → Blackland Fire Dragon

Castle of Dark Illusions + Arlownay → Rose Spectre of Dunn

Castle of Dark Illusions + Petit Dragon → Blackland Fire Dragon