Death Game Card: Coin

You and other participants are brought to a dimly lit room. You all take your seats and are each given 21 coins. “What is going on?” you think “am I multiplying the weight of life by 21 grams?” Suddenly, you hear a voice... It’s time for some fun and games. There are costs for you to live. Yes, I think 1 coin per turn sounds good. Only one card can be used at that time, and if you can’t pay....well...game over for you. Don’t worry, I don’t mind taking change if you have it. I’ll keep you alive as long as you can pay.... Each time it’s your turn, you can play only 1 card and pay 1 coin to keep you alive until your next time. And maybe there’s something about available change...?