Darkfire Dragon + Bolt Escargot → Thunder Dragon

Darkfire Dragon + Bolt Penguin → Thunder Dragon

Darkfire Dragon + The Immortal of Thunder → Thunder Dragon

Darkfire Dragon + Electric Snake → Thunder Dragon

Darkfire Dragon + Wing Eagle → Crimson Sunbird

Darkfire Dragon + Punished Eagle → Crimson Sunbird

Darkfire Dragon + Skull Red Bird → Crimson Sunbird

Darkfire Dragon + Queen Bird → Crimson Sunbird

Darkfire Dragon + Armed Ninja → Flame Swordsman

Darkfire Dragon + Magical Ghost → Dragon Zombie

Darkfire Dragon + Sea Kamen → Spike Seadra

Darkfire Dragon + Burglar → Flame Cerebrus