Tainted Grail: Conquest

Quest Cards are coloured Green and are obtained from the Lost Soul in the village, by asking for the option to pick 1 of 3 random cards. Each card is named for one of the Seven Deadly Sins and have varying effects. Each is upgraded by using it and activating the effect (e.g. the Greed card is obtained by using it to attack enemies, the Lust card by sacrificing HP). If you mouse over the card, it will tell you what you need to do until it upgrades itself. The cards may only be used once per battle, so you will need to fight a lot of encounters to complete the task associated with it. They are lost upon death, so try and finish them quickly if you think you will not complete the run.