The bits and bobs of new cards lend themselves to enhance existing EDH-strategies however, and not necessarily in 3-color decks. They have just good cards smattered into a standard set.
Halo Fountain is a cool card draw effect in token decks.
An Offer You Can't Refuse is 1 mana non creature counterspell for a treasure.
Cemetery Tampering fills your graveyard AND gives you a card to cast for free once your graveyard is filled with a decent amount of cards.
Ubrarask is a cool commander and also nice idea for a 99 card.
Bootlegger's Stash is great.
Vivien is a birthing pod on a stick.