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One of my favorite magic items to give players. I don’t remember which DM I stole it from, but it’s so fun. I don’t remember the precise wording but it’s something like

All or Nothing Coin

While in possession of this coin you may choose to expend one charge to replace your d20 with a coin for your next attack, save or check. Treat a heads as a natural 20 and a tails as a natural 1.

The coin may hold a maximum of 4 charges at time. At dawn all charges are either depleted or restored (determined by coin flip)