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unless you exclusively run ramp capable of making black mana i wouldnt run obliterator...its a lot of ...unbreathing horde is decent if you have a lot of zombies in play from endless and useless if you dont - he needs a more zombie heavy deck here he's dead weight

there's a lot of great zombies, many new ones from return to ravnica

there's a lot of fatty zombies a few of which are good, ill point out noxious ghoul especially
id skip endless ranks here...youre already stretching a little thin when you decide to run ramp...putting in cards that work well with endless will just stretch it too thhin - this last remark depends on how casual your meta is cuz the more casual it is the stronger endleess gets: if sweeps and/or control is rare endless is an absolute powerhouse, if its common - or iff the agro decks tend to be really fast its too slow and eeasily handled.