Michael Majors's Green-White Megamorph was one of the more interesting decks to come out of the SCG Open last weekend. Historically, decks with green and white creatures have been aggressive decks that tried to win the game as quickly as possible. This deck is far from that. In fact, Green-White Megamorph is all about value. Most of the creatures and spells in Majors's deck are worth two cards for the price of one.
Hangarback Walker is the most versatile artifact in Standard right now. It comes down as early as turn two as a 1/1 and just gets bigger and bigger the longer it stays alive. If it dies, you can cash it in for a bunch of 1/1 flying Thopter tokens, which makes your opponent less and less likely to kill it the longer the game goes on.
Many creatures in this deck are two-for-ones, including Den Protector, Deathmist Raptor, Hidden Dragonslayer, and Wingmate Roc. The new Battle for Zendikar planeswalker Gideon, Ally of Zendikar makes an appearance here as a four-of and is just another example of this deck's versatility. If you're winning, Gideon can create an emblem right away to help close out the game. If you're losing, Gideon can create tokens to help you stay alive. Gideon also attacks for five and is extremely difficult to kill in combat.
One of my favorite cards here is actually a sideboard card. Evolutionary Leap is an amazing card in this deck, as it replaces all of your creatures that are about to die with new ones. As long as you keep green mana open, any time that your opponent targets your creature with a Ruinous Path, Reave Soul, or whatever removal spell is thrown your way, you can sacrifice that creature in response to get a random creature off the top of your library. If you're playing against a grindy attrition deck, this card allows you to run them out of resources and gives you inevitability. That's a lot of value for a two-mana card.