Sword Arm of Dragon + Sanga of the Thunder → Twin-headed Thunder Dragon

Sword Arm of Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Sword Arm of Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Sword Arm of Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Sword Arm of Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Sword Arm of Dragon + Bolt Penguin → Twin-headed Thunder Dragon

Sword Arm of Dragon + The Immortal of Thunder → Twin-headed Thunder Dragon

Sword Arm of Dragon + Electric Snake → Twin-headed Thunder Dragon

Sword Arm of Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Sword Arm of Dragon + Electric Lizard → Twin-headed Thunder Dragon

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

Koumori Dragon + Thunder Dragon → Twin-headed Thunder Dragon