Most lands are permanents that have mana abilities (abilities that make mana)
SpellTable , previously known as VirtualEDH , was quickly developed as a way to keep the Commander game mode alive (since Commander had limited online support at the time)
While they arent foil, they do have a new-and-improved glossy finish that Wizards demoed on Twitter
You could easily find yourself in a matchup where its actually good, have it in your opener (and its not a great topdeck), draw three or four extra cards over the course of the game, and eventually lose to The Scarab God
They dont provide mana, but K'rrik, Son of Yawgmoth, Bolas's Citadel, and Defiler of Flesh offer you the chance to pay life instead of mana
This allows you to customize your deck to your own style, whether its for a commander format or just for fun