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
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
Is a card that just gains a ton of life mythic
Especially in Commander, Multanis power and toughness can grow to obscene heights, and it features prebuilt imperviousness thanks to holding the shroud keyword ability, which protects it from all targeted spells or abilities (even if youre the owner of Multani)
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
It triggers a lot of support cards and ensures youll always have something to do with your mana