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Describe the Bug:
When Nim Devourer return from gy ability is activated by AI:
1- Nim Devourer doesn't come first on battlefield and then sacrifice a creature,creature gets sacrificed first.
2- Nim Devourer when comes on battlefield is probably sacrificed,too.
When Nim Devourer is owned by human:
3- and it is in graveyard as soon as upkeep step comes it vanishes from graveyard and all cards under it in graveyard.similar bug:http://www.slightlymagic.net/forum/viewtopic.php?f=86&t=18227&p=192334&hilit=vanish+graveyard#p192334
Which card did behave improperly ?
Nim Devourer

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
1- AI- Nim Devourer first comes on battlefield then you sacrifice a creature.
2- AI- Nim Devourer doesn't get sacrificed.
3- Human- Nim Devourer doesn't vanish itself and cards under it in gy.

Are any other cards possibly affected by this bug ?
-

Fixed in 8950a55

Don't know if this is an AI issue or a card issue, but the AI frequently activates it and then chooses to sacrifice it once it returns to bf. It happens to fast to see exactly what's happening, but it spends mana to do nothing.

When in human's gy it disappears during upkeep if you have a crit to sac.

Fixed in be79aa3

AI is still bugged. AI is forced to return Nim Devourer each time from graveyard and then sac Nim Devourer itself to it's ability though AI has better choices to sac.
I tried by giving AI 0/1 creature,vanilla 0/2 creature vanilla 1/1 creatures still AI sacrificed Nim Devourer 6/1 (with 5 artifacts on AI side).