Metallica

Metallica is a race of creature in the Light Civilization.

Details
Their card names are completely comprised of Kanji.

While the race was first previewed in DMR-23 Dogiragolden VS Dormageddon X, the last set in the Revolution Final block, they were released in greater number in DMRP-01 Come On Jokers!!.

Story
They are giants made of minerals and are one of the lifeforms taking the place of Dragons in a world where Dragons went extinct due to the fallout of the battle between Dormageddon X and Final Dogiragolden.