Gaia the Dragon Champion + Mega Thunderball → Twin-headed Thunder Dragon

Gaia the Dragon Champion + Electric Lizard → Twin-headed Thunder Dragon

Curse of Dragon + Oscillo Hero #2 → Twin-headed Thunder Dragon

Curse of Dragon + LaLa Li-oon → Twin-headed Thunder Dragon

Curse of Dragon + Kaminarikozou → Twin-headed Thunder Dragon

Curse of Dragon + Sanga of the Thunder → Twin-headed Thunder Dragon

Curse of Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Curse of Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Curse of Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Curse of Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Curse of Dragon + Bolt Penguin → Twin-headed Thunder Dragon

Curse of Dragon + The Immortal of Thunder → Twin-headed Thunder Dragon