Vessel of Avarice
rare magic item, single use, use does not require an action
A small earthenware pot which fits in the palm of your hand. It features a face with an impossibly wide grin on one side. Holding it makes you feel like you can draw two of something and add it to your hand... whatever that means.
On use: DM flips a coin. If heads, the player receives an additional bonus action for this round of combat, or the first round of the next encounter if used outside of combat. If tails, the player receives two random cards from the Deck of Many Things. Regardless of result, the item is destroyed.