They're fine decks for beginners who want to play some fun, casual matches. Another good place to start is the "Duel of the Planeswalkers" games which are available on PC, XB1 and PS4.
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I haven't bought cards in yeeeears, gave away everything except 6 solid decks to a friend's kid. The coolest things I've still got are got a few cards I traded from a high school buddy who was a very serious player and died in a hiking accident right after graduation. Mox Diamond, Grim Monolith, Tolarian Academy. The first two are quite valuable anymore but I'd never sell them. He also had a number of OG moxes, dual lands, and other super valuable stuff. Always wondered what became of his collection.