This is a cube made up of free cards from the MTG Arena 2020 New Player Experience (NPE) starter decks. This allows new Arena players to draft with each other (e.g. on MGTADraft), and then play each other on MTG Arena via direct challenge with free cards they have in common.

Note: If you draft on a site that introduces basic lands you don't have on MTG Arena, substitute these that are supplied with the NPE Decks in your deck lists:

1 Forest (ANB) 112
1 Island (ANB) 113
1 Mountain (ANB) 114
1 Plains (ANB) 115
1 Swamp (ANB) 116

For those that like constructed play, use the list of all NPE 2020 cards as a reference for seeking to build better decks using only NPE cards. New players can get a feel for the relative strengths of those decks from the rankings on Draftsim's artcle "The Best MTG Arena (and Paper) Starter Decks Ranked". For example, take their top-ranked Gruul "Stomp, Stomp" (red-green) deck, look at this cube list, sort it by Elo, and you'll see that there are a number of cards that make "Stomp, Stomp" work even better.

For more introductory MTG resources focused on budget play, including how to draft the Arena Newbie Cube 2020 on MTGADraft, see my Resources for Magic: The Gathering.