The Battle decks are some sort of theme deck that comes with 60 cards and that can, theoretically, be used to play off-the-self
see rule 420
Combined with the casual mode for practicing, Live should be really easy to join for new players
Especially if you played a bunch of Bloomburrow Draft or Sealed, you probably have a halfway decent start on the creature base you need for a deck like this
Warp World: With a lot of tokens, you can reset the board with all your creatures, artifacts, lands, and enchantments (minus your graveyard and exile zones) out on the battlefield
As has been the case in the trading card game lately, TCGplayer has been the cheapest, with unopened listings starting at $21.89, including shipping, narrowly above its $21.65 market price