Doppelgang is a bad clone for 5 mana, a 4-for-1 at 8 mana, and a logistical boardstate nightmare at anything at or above X=3
Maximize Your Tribe Generally speaking (and I'll get into a couple exceptions later), if you're going to be playing a ton of cards to make your tribe work, you should make sure you maximize the strong parts of your deck: the tribal parts
He offers so many lines of play each turn that he functions as a one-card control engine
Lets take a look at a few hypothetical decks, starting with an update of G/W: Creatures (17) 1 Nissa, Vastwood Seer 4 Hangarback Walker 1 Linvala, the Preserver 4 Sylvan Advocate 2 Archangel Avacyn 2 Bruna, the Fading Light 3 Gisela, the Broken Blade Planeswalkers (4) Lands (26) Spells (13) This is clearly a different take on G/W Tokens, functionally removing Gideon, Ally of Zendikar from the deck to incorporate the Angel package
It triggers a lot of support cards and ensures youll always have something to do with your mana