Cog Dragon

The Cog Dragon is an EX Tier Cog. He requires 1 tribute to be summoned. He is immune to all card effects. He has 4 powerful fusions, Twin Cog Dragon, Ultimate Cog Dragon, Final Cog Dragon and Bugs, the Cog Dragon Master.

Trivia:
His HP & ATK used to 3 but was increased to 5.


 * He also never had a tribute cost until his HP & ATK were increased.