Let's say I cast (No Rest For The Wicked) and I accidentally sacrifice at the beginning of my turn, will the ruling still be in effect for the rest of the turn?
IE
I cast no rest then sacrifice it, then cast a creature, opponent fatal pushes it, does the creature go back to my hand or does it go into the graveyard?
I'm not sure how you can accidentally sacrifice something (MTGO misclick perhaps?) but No Rest for the Wicked has a one-shot effect. It will take action on every creature card that is in your graveyard at the moment that it resolves provided that they were put there from the battlefield this turn. It doesn't set up any effect that would apply to things that happen later.
I am not sure how you "accidentally" sacrifice it (unless it is a misclick on MTGO or something), but its effect applies at one time: when the ability resolves. Anything that goes to the graveyard after the ability resolves will not be affected by the ability. You will not get them back.
IE
I cast no rest then sacrifice it, then cast a creature, opponent fatal pushes it, does the creature go back to my hand or does it go into the graveyard?
I'm not sure how you can accidentally sacrifice something (MTGO misclick perhaps?) but No Rest for the Wicked has a one-shot effect. It will take action on every creature card that is in your graveyard at the moment that it resolves provided that they were put there from the battlefield this turn. It doesn't set up any effect that would apply to things that happen later.
No Rest for the Wicked
Fatal Push
I am not sure how you "accidentally" sacrifice it (unless it is a misclick on MTGO or something), but its effect applies at one time: when the ability resolves. Anything that goes to the graveyard after the ability resolves will not be affected by the ability. You will not get them back.