Fate's Fivepence

Wondrous Item Uncommon (this item requires attunement)

This electrum coin has a smiling human woman's face on one side (heads) and a scowling fiendish woman's face on the other (tails). While you're within 30 feet of the coin, you can summon it to your hand by speaking its command word as a bonus action.   Fate Flip. This coin has two charges. You can attempt to regain these charges once every 24 hours by flipping a coin. The coin regains 2 expended charges if it's heads, or 0 if it's tails. When you have the coin on your person and your total for an attack roll, ability check, or saving throw is 10 or lower, you can expend 1 of the coin's charges to channel its magic and forge your own luck. When you do, flip a coin. If it's heads, roll a d10 and add it to the total of your roll. If it's tails, you subtract a d10 from your total instead.