Like in the games, Umbreon is more of a defensive disruptor than it is an attacker
This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)
Spree is a versatile mechanic, letting you use multiple abilities for just one spell
The Commander decks that come out each year are an excellent purchase if youre looking to build a Commander deck, and the same is true of the more recent Brawl decks introduced alongside the Throne of Eldraine set

Tomer gives an in-depth analysis of the new Urza precon and provides an optimized $30 and old-border only upgrade list to maximize its power!Read more Tomer gives an in-depth analysis of the new Mishra precon and provides an optimized $30 and old-border only upgrade list to maximize its power!Read more The crew discusses and ranks their favorite finishers in Commander.Read more There was a lot of buzz around a certain counterspell so let's see if it's as problematic as most people made it out to be!Read more A reference table of all the instant-speed tricks in The Brothers' War.Read more The Brothers' War removal by color, rarity, and converted mana cost.Read more Open some attractions and ride the carts straight to victory with this powerful new Izzet Spellslinger Artifact commander!Read more The meme said to T-Pose to establish dominance, so TheAsianAvenger built a deck with cards flexing the T-Pose.Read more Richard and Niuttuc join the crew for a game of Anything Goes!Read more What are the odds of winning by comboing Rooftop Storm and Acererak the Archlich in Modern

One useful tip: never throw away or bulk-sell cards without scanning them first