Snatch Steal: This issue here is similar to what was mentioned on the "Snatch Steal vs. Giant Trunade" thread. If I have my opponent's monster through "Snatch Steal" and that is the one I choose to defend me, when "Last Turn" resolves and all other cards are sent to the graveyard, control of that monster would return to my opponent since "Snatch Steal" is no longer on the field.
Call of the Haunted: Because of the wording on the card, if I chose a monster that was brought back to the field by "Call of the Haunted", that monster would be destroyed by the effect of "Call of the Haunted" simply leaving the field so I would essentially lose.
Premature Burial: The situation here is different. Again, the effect here is similar to if "Giant Trunade" was used. The monster is not destroyed if "Premature Burial" is sent from the field (and not destroyed). So if I choose a monster brought back to the field by "Premature Burial", that monster will stay on the field after "Premature Burial" is sent to the graveyard by "Last Turn".
Dark Necrofear: 4 different cases here.
1) Dark Necrofear is a monster on my side of the field. I can pick her as the one to defend me and if she's destroyed in battle or by something else, she will be coming back and stealing my opponent's monster giving me a win or tie at the very least.
2) Dark Necrofear is a monster on my opponent's side of the field. Since "Last Turn" does not destroy the cards, just send them to the graveyard, she isn't coming back at the end of turn.
3) Dark Necrofear is an equip card on my side of the field attached to my opponent's monster: Same as if it were "Snatch Steal" attached to my opponent's monster. She will not return to the field either.
4) Dark Necrofear is an equip card on my opponent's side of the field attached to my monster: Both "Dark Necrofear" and my monster would be sent to the graveyard. She will not return to the field either.
Mortals: I saw you on when I posted initially so that's why I said to IM me didn't realize you left right after that... I am on the east coast so when you returned, I was already asleep.
- Andrew