Tribal Tamers (V Series)

"Tribal Tamers" (部族のテイマーズ Buzoku no teimāzu) is a clan from the Vulcan's Belt nation. Their primary focus is resting and retire rear-guards in order to call powerful fossils from the deck or hand.

Background
What is Tribal Tamers? - Tribal Tamers is a group of Shamans and Witch Doctors of which Headquarters located in "Vulcan's Belt", the nation of underground. They do rituals with Fossils and turn them into dragons and beasts. After an arrival of the Gem Foundation they also started doing experiments and science.