At the very least MS will clog up the ground long enough to produce some heavy-hitters of your own
Dream Twist, Mulch, Deranged Assistant, Forbidden Alchemy, Armored Skaab, and Civilized Scholar are typically the best options but Ghoulcaller's Bell can also be a fine addition
For more details on Foundations, make sure to bookmark our MTG news page and follow Wargamer on Google News - and you should definitely read Matt Bassil's piece on the blue-sky idea of banning every card except Foundations
Right off the bat, the lands are held back by entering tapped and requiring a decent chunk of power to station
Oh, and those creatures your opponents play enter tapped, meaning you can leverage the battlefield favorably and be aggressive when needed