The Card Cultivator - deckbuilding litRPG

After a suspicious event ending in a disaster, Mark wakes up in a heap of trash with a card floating in front of him. He suddenly finds that after every fight he's rewarded a card. The cards give him fighting skills, which he can upgrade. However, accused with breaking an expensive item he must fight against a much stronger opponent or pay its price. He has five weeks to prepare for the fight, will he be able to beat the odds or will he lose his life to loan-sharks?

[participant in the Royal Road Writathon challenge]