Card Kingdom: This kid's codex is full of gold

[Cards, Summoning, Card Draw, Codex, Gold Cards, Invincibility, Pets, Starting Game]
In the world of cards, after defeating monsters, humans have a chance to obtain monster cards, which are embedded in the codex and can be used by summoners to summon card beasts.
Zhang Yungao awakened as a Summoner in one year, and his Codex contained a talent: [Fusion].
[Fusion]: Can infinitely fuse cards of the same type into higher-tier mutated cards.
10 Slime Cards = Captain Slime
10 Slime Captain Cards = Slime Boss
10 Slime Boss Cards = Slime General
10 Slime General Cards = Slime Tyrant...
...
10 Skeleton Soldier Cards = Sword Skeleton
10 Sword Skull Cards = Skeleton Slayer
Skeleton Slayer Card x10 = Skeleton General
10 Skeleton King Cards = Undead Skeleton
...
With this talent, Zhang Yun fused together a god-level gold card and gradually embarked on the path to invincibility...