You feel warmth and happiness while having this coin on your body. If you play with it or keep it in touch with your skin foe an hour, you can attune to it. While attuned to it you have extraordinary luck when things get tricky. 

You gain one luck point that you can use as the same feat describes, and potentially adds up to the number of luck points you already have. You regain the expended luck point after a long rest. 

However, when the coin gets stolen from you, when you loose it or give it away for 10 minutes or longer, you break your attunement to it and suffer disadvantage on ability checks from bad luck until you finish a long rest or until a remove curse spell ends this effect on you. 

Notes: humanoid