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Describe the Bug:
When a creature returned from its owner's graveyard to the battlefield via Apprentice Necromancer's activated ability phases out before the end step of the turn during which it was returned to the battlefield that way, it is sacrificed during that end step.

Since creatures with the Ball Lightning clause correctly stay on the battlefield (are not sacrificed during end step) if they are phased out, the observed bug must be related to Apprentice Necromancer (and similiar cards, see below) or rather the legacy effect its ability attaches to the reanimated creature..

Which card did behave improperly ?
Apprentice Necromancer

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
JOU, duel

What exactly should be the correct behavior/interaction ?
A phased out permanent is treated as though it doesn't exist and hence can't be sacrificed/exiled etc in that state.

Are any other cards possibly affected by this bug ?
Also tested Shallow Grave/Corpse Dance -> same bug.

Probably also affects similiar cards like Sneak Attack, Skirk Alarmist, Shifty Doppelganger, Footsteps of the Goryo, Junkyo Bell, through the Breach, Stone Giant, creatures with unearth/Sedris, the Traitor King (phasing out is not considered leaving the battlefield ruleswise, but an unearthed creature will be exiled at the end of a turn during which it phased in or if it would leave the battlefield that turn, unless it phases out again before either happens), Berserk, Goryo's Vengeance, Dawn of the Dead, Gruesome Encore, Postmortem Lunge, Whip of Erebos, Fatal Frenzy, Impromptu Raid, Incandescent Soulstoke, Killer Instinct, Krovikan Elementalist, Slave of Bolas, Treacherous Urge and/or Zirilan of the Claw.

Fixed in fc88989 for all the instances as it's a global bug.

The interaction between Apprentice Necromancer and Teferi's Veil is fixed as of CoRM15 mini.

Unearthed creatures still are exiled at end of turn when they're phased out.

Also I have to correct my above statement regarding unearthed creatures' behavior: An unearthed creature's delayed triggered ability (exile at eot) will only check for the creature once, for example at the end of a turn during which it phased out via Teferi's Veil, so it won't be exiled at the end of a turn during which it phased in.
The replacement effect (exile if would leave battlefield) will still be in place after an unearthed creature has phased out, though. So if it phases in and is bounced/destroyed/blinked etc, it will be exiled instead.

Nexhro wrote:Unearthed creatures still are exiled at end of turn when they're phased out.

This part is not fixed yet. Should this go into a separate report? It's mentioned in the other cards' bugs section, though.

Fixed in 81d65a0

Oh so close...

Unearthed creatures that phase out are not sacrificed at end step...check.
When such a creature is killed or unsummoned it...disappears. It does not go to hand, gy, or exiled zone. So get it to show up as exiled and all is good.

Fixed in a127724