Well, only costing a single mana means you can get it down and start swinging before opponents can put up blockers
While it's not a requirement to play the game casually with your friends, if you have valuable cards, or if you're playing in a tournament, you absolutely need to have them
Its not the best topdeck, but decks that are interested in this sort of card dont have all that many of those anyway
Why Commander Is One of the Best Ways to Start Magic Magic: The Gathering has many formats Standard, Modern, Pioneer, Draft, Sealed, Pauper, Legacy, Vintage, Brawl, and more
2-4 board wipes feel correct most of the time