From the about page: https://mtg.jessitron.honeydemo.io/about

You need:

A friend (or two or three) to play with

A shared voice chat, like Discord

A shared online white board, like Mural, which serves as the table

Decks defined in Archidekt (or use the preconstructed decks we've downloaded)

This app for each of you to manage your library and hand

Each of you can choose a deck in this app, then shuffle up. Draw cards to your hand, then click on them to do more. When you play a card in MTG Deck Shuffler, it gets copied to your clipboard. Then paste it into Mural!