Card Crafting: How Do You Fight an Opponent With Hidden Mechanics?

After transmigrating to another world, I became a student learning to make magic cards. What should I do without a golden finger?

“Don't worry. There are so many genres from my previous life. I can find a few that will keep me busy.”

“Escanor, come out and show them how it's done!”

Han Xing pulled out a magic card without another word.

“How can a skinny kid like that call himself a magic card? He doesn't look strong at all.”

“Oh?”

Han Xing chuckled. Another magic card appeared in his hand, an utterly ordinary sunny-weather card.