Yu-Gi-Oh! GX: Inflicting Depression Gives me Points

Rowan transmigrates to the Yu-Gi-Oh universe and awakens the “Strongest Duel Depression System,” starting off with a downright toxic deck. By inflicting depression on your opponent, you can obtain "emotion points" from them, which can be exchanged for various card decks and abilities from the system. Extreme damage-dealing decks, insidious mind-game decks, even the ability to perceive card spirits and manifest them into reality… "Dueling is all about bringing a little… ‘despairing smile’ towards your opponent.” — Description from novelcodex.org