Mulligans
General Mulligans
While you may not be able to use Wishing Well immediately, having the card available as soon as possible will help utilize the entire point of your deck much quicker. Velarok is someone you generally want to have in your hand for his synergy with a lot of the deck, and the rest listed here are mostly just good early options to get all the things you need, like Invokes and Coins.
Rogue
A hypothetical deck which utilizes Umbral Skulker as well as a few other new cards from Showdown to gain as many coins as possible to use on the Wishing Well. Unsure if the Counterfeit Coin works on the well, but if it doesn’t, you can probably swap them out with Preparation or something like that. Also includes some thief rogue mechanics, so you’re not solely relying on the well.