I was playing standard match against kavaero / bringer of the last gift combo.
oppo had Kiora, the rising tide and a town greeter on the board when kavaero was cast.
there was 2 bringer of the last gift in oppo grave.
kavaero resolves entering as bringer of the last gift. the cast trigger goes on the stack.
both our board gets sac'd and the return to the battlefield trigger happens.
somehow my oppo ends up with a board that consists with the
- kavaero (bringer)
- Kiora, the rising tide (the one that was sacrificed) this creature should not have come back
- both Bringer of the last gift

my board has nothing since i had nothing in the graveyard when bringer resolved.

oppo graveyard only had town greeter for creatures and misc non creature cards
my graveyard has my 2 creatures i had to sac.