Good Mythical Morning Table of Contents show What Is the Mystery Booster Set
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It's main use is to be super fun with things like Well of Lost Dreams ("Instead of drawing this card, I'll gain life and also draw cards!") Sadly, you don't have blue in your color identity, so you can't play Drogskol Reaver, but for redundant copies of that effect, you do get Dawn of Hope once Guilds of Ravnica releases and even Lich's Mastery if you're crazy enough
However, Magic players have never really had a good incentive to build a deck with more than 60 cards outside of Battle of Wits
The second of these two cards is Rin and Seri, Inseparable, which allows for a brand-new archetype in Commander that lets you play with a deck entirely composed of cats and dogs
Obviously, this is brutally strong and Teferi, Time Raveler is banned in multiple formats as a result