A Scratch Incremental-Card Game

Ok, So i've been working on a game/project which is a incremental/card game which works as follows:

You are a slime which kills other slimes for cash, every time you kill the same slime 5 times the slime gets more hp and gives more rewards, you can go to the shop to buy cards that can increase your max damage, min damage, etc...

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Now, i would like to know if any of you guys have any ideas for cards i should make?

(list of already existing cards so you dont say for me to make the same card again: (Extremely Commons:: Toughen Up 2+ Max HP/ Balancing: 1+ min dmg per card / multi vitamins: 1+ max damage per card /// Very Commons: every one of the cards told previously has + versions of themselfs that gives 2x more stats / Commons: same thing as very commons but its 4x better than extremelly common cards in stat gain / Rares: Life fountain 1+ Max hp/10s / Stealer Skill: gives more cash per kill / Smart Thinking: Makes you 1% more likeable to dodge an attack (stacks up to 50%) and the last one is a card that when killing enemies you heal 10 hp))