The reason is explained in this article, but the general reason is that lands are best for casting your commander and ramping, outside of that they have very little function
Tawnos, Urzas Apprentice Tawnos, Urza's Apprentices doubling an artifacts activated ability or triggered ability can be pretty powerful
Wanted dead or alive, Oko and his gang of bandits plan the heist of the century in this magical twist on the classic western
Recurring Nightmare If you actually read how Recurring Nightmare works, it's easy to see why it was banned in Commander
While many designers complained that they hated it pumping opponents creatures, which was an intended drawback, in my experience it never came up to devastating
You'll often be able to cast Hour and then immediately start rebuilding your board, while it's doubtful that you can convince any smart person to assist you with more mana than you actually need to cast Play of the Game, so chances are that board clear is all you're doing on your turn