Our own Jason Alt already built a deck around him which you can check out here - Saruman's Caress of Steal | Article by Jason Alt (coolstuffinc.com)
Claudio Torres, Brandon Watson, and Matt have been showing off their work and answering questions on the MTGSalvation forums for a long time
These can accomplish a wide variety of feats, from countering your opponent's plays to gaining more mana to dealing with threats on the board
Wrenn and Six Wrenn and Six is a card from Modern Horizons that may seem unassuming, but, in actuality, it's the backbone of the early game for a lot of the four and five-color decks in the format, namely the Indomitable Creativity and Omnath decks
The Painter's Studio side at 2R offers the typical red card advantage formula, exiling the top two cards and letting you play them until end of next turn
For the price of four ink, you get a bit of pretty much everything: defence, lore, the ability to draw cards and the power to heal your other characters