Magic of giving.

This book is about a man called John. He died by being struck by lightning and reincarnates into another world filled with magic. At first, he saw only one mage, so he didn't know what his power is but, as the story progresses, MC understands that his advantage is imitating, and controlling every magic he sees. He can keep only a few for himself and can give the rest to his friends. Sounds nice at first, but how can he distinguish between real friends and people who only yearn for his power? Follow John on his journey filled with betrayal and hardships as he continues to push forward until he finally achieves his ambitions. (First 20 chapters are just introducing the reader to the world. And it needs to be this way to show how rare mages are.)