Yamadron + Kaminari Attack → Twin-headed Thunder Dragon

Yamadron + Tripwire Beast → Twin-headed Thunder Dragon

Yamadron + Bolt Escargot → Twin-headed Thunder Dragon

Yamadron + Bolt Penguin → Twin-headed Thunder Dragon

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

Yamadron + Electric Snake → Twin-headed Thunder Dragon

Yamadron + Mega Thunderball → Twin-headed Thunder Dragon

Yamadron + Electric Lizard → Twin-headed Thunder Dragon

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

Seiyaryu + Thunder Dragon → Twin-headed Thunder Dragon

Seiyaryu + Kaminari Attack → Twin-headed Thunder Dragon

Seiyaryu + Tripwire Beast → Twin-headed Thunder Dragon