Proliferate cards, like Cankerbloom and Yawgmoth, Thran Physician, help a ton here too, giving you even more experience to work with
This is a good hint, because every event that leads to a life change: either it increases them, that means you get lifes
Company Commander BPhillipYork: Creating 3 Soldiers for 4 is decent, especially if you have ways to recur this to get lots of triggers, giving deathtouch is interesting, there's cards like Hooded Blightfang and Fynn the Fangbearer, but they generally care about the creatures attacking - Blightfang does, Fynn doesn't
One of designer Gavin Verhey's playtest cards at a recent Magic convention also let you cast all your creature cards as Colossal Dreadmaws - a precursor for Dino DNA's release
Deny the Witch This four-cast instant costs three colors of mana but is very strong with the ability to counter any spell or activity and then force that person to lose some life
Scene Boxes Two new scene boxes are coming alongside the launch of The Hobbit: Crack the Plates and The Treasures of Smaug