They Threw Away an R-Rank. Then I Woke Up Every SSR.​

What the story is about

After transmigrating into a world where humans summon Spirits from cosmic card pools to fight monsters, Xia Yuan is summoned as an apparently worthless R-rank card and nearly fades away when his first Contractor rejects him. Mo Shiyu gives him a contract, awakening a system that lets him transform into powerful beings and gain their abilities as he battles increasingly dangerous threats.