Darkfire Dragon + Guardian of the Sea → Spike Seadra

Darkfire Dragon + Aqua Snake → Spike Seadra

Darkfire Dragon + 30,000-Year White Turtle → Spike Seadra

Darkfire Dragon + Kappa Avenger → Spike Seadra

Darkfire Dragon + Kanikabuto → Spike Seadra

Darkfire Dragon + Zarigun → Spike Seadra

Darkfire Dragon + Destroyer Golem → Stone D.

Darkfire Dragon + Barrel Rock → Stone D.

Darkfire Dragon + Minomushi Warrior → Stone D.

Darkfire Dragon + Stone Ghost → Stone D.

Darkfire Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Darkfire Dragon + Tripwire Beast → Thunder Dragon