Jace, the Mind Sculptor does a Brainstorm for its 0-loyalty ability, too
We think the header pretty much covers it, but just in case, let us elaborate: until the April game update, you'll be able to earn quest progress when challenging your friends in MTG Arena
If an effect would shuffle cards into a deck but there are no cards that meet the requirement and zero cards are to be shuffled in, the deck is not shuffled
that's a seven drop creature that does not end the game
If you read between the lines, for 4 mana on the first cast, you get to choose from 16 cards in a full-sized Commander table that then can be cast to assemble your remaining combo or just find the combo pieces you need to kill them on the next turn with, of course, Demonic Consultation + Thassa's Oracle