I feel like I should let you know that the title of the set the miniatures is from should be just "Guildmaster's Guide to Ravnica," being a Magic: The Gathering themed release as part of D&D's 'Icons of the Realms' line of miniatures. Waterdeep is a D&D location not related to Magic: The Gathering and shouldn't be part of the title.
The mistake probably stems from a typo on the minis gallery website. The following webpage lists it as Waterdeep:
https://www.minisgallery.com/dnd/dnd19.htm
But if you go a step back and look at all of the Icons of the Realms releases, you will notice that the Waterdeep name is absent from the title of the Guilds of Ravnica sets:
https://www.minisgallery.com/dnd/icons/index.html
It's a minor detail but one I thought I should mention.
As a Magic player myself, I am familiar with the source material for these miniatures. I wouldn't mind taking a crack at some customs but I would find it hard to mentally separate the figures from the cards that I know inspired them... lol.