If you're just trying to get a snapshot of a format but don't have time to read up on every card in a set, there are some categories of cards you should focus on
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Older sets used to use codes like these to give you free MTG Arena packs to boost your collection and decks
Theres quite the range on Snuff Outs price, especially if youre interested in a foil copy, but the cards original printing form Mercadian Masques is, by far, the cheapest one
The Amethyst/Ruby Starter Deck has some fairly interesting new cards with intriguing abilities
The strength of Vorel of the Hull Clade is that it costs a low amount of mana, and its effect is a low mana investment