If you really want to, you can apply the effects of both Pokey’s second and third abilities to a coin flip or a d20 roll. For example, if you would flip a coin, you can choose to replace that flip with a d20 roll, and you can choose to replace that d20 roll with a coin flip. (Since you can only apply a replacement effect to a single event once, the nonsense stops there.) In that case, you’d flip a coin. If it’s heads, that would count as 20 for the replaced d20 roll, which would count as heads for the originally replaced coin flip. Great job.