Proposing a Time Limit

"Possible but honestly speaking, the User does not have the resources to make the mini game come true properly."

"Why so?" 

"Even though they put in the effort to create those cards based on our minions, most of our monsters are terrifying and powerful which makes the battles even less meaningful. Even if we were to put them as five or six star rarity on them, the problem would be balancing the characters to make sure that they are working all useable. Rather than relying on that one or two overpower cards that could destroy the mini game." The System stated. 

"If it is just a mini game for the fun of it, then it is fine. But if it's for longevity purposes, it will fare badly without consistent development despite the fact that User had been getting minions as if he was going out for a walk to gather some flowers from the side of the road."