Sky Dragon + 30,000-Year White Turtle → Sea King Dragon

Sky Dragon + Destroyer Golem → Stone D.

Sky Dragon + Barrel Rock → Stone D.

Sky Dragon + Minomushi Warrior → Stone D.

Sky Dragon + Stone Ghost → Stone D.

Sky Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Sky Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Sky Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Sky Dragon + Bolt Penguin → Twin-headed Thunder Dragon

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

Sky Dragon + Electric Snake → Twin-headed Thunder Dragon

Sky Dragon + Magical Ghost → Curse of Dragon