What Does It Mean for Your Main Monster Card to Be Your Own?

"Card masters can actually be divided into two development directions." "The first is the card maker. The card maker needs to separate the elements from the crystal, use the elements to build and sew the prototype of the card, and then use the fragments to fill the gaps between the elements, so that a card can be successfully made." "The second is the combat card master. The combat card master needs to enter a foreign land, look for elements, crystals and fragments from it, and then hand them over to the card maker to make more cards." "Generally speaking, every card master will study both card making and combat during the apprenticeship stage, and then choose one of the two for further cultivation. After all, human energy is always limited. However, there are always geniuses in this world who can be compatible with and master both skills at the same time..." "What do you mean you are the genius?" "What do you mean your card making method is different from ours?!" "What do you mean you can enter the background story of the card?!!" "What do you mean you can make cards while fighting?!!!" "What do you mean your main monster card is all yours?!!!"