Colorless Planeswalker

When the entire world is reduced to a huge and broken "space-time battlefield", the fate of every living being is marked by the mana of the five-color magic ring (white, blue, black, red, and green). Chen Yu, an amnesiac young man, woke up and found that there was a colorless magic ring embedded in the palm of his right hand that could absorb and copy any mana. This was the legendary taboo power that had long been annihilated and could arbitrate all colors.