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At the beginning of your end step, choose target permanent card in your graveyard. You may sacrifice a permanent that shares a card type with the chosen card. If you do, return the chosen card from your graveyard to the battlefield and it gains "If this permanent would leave the battlefield, exile it instead of putting it anywhere else."
Because to die means to be put into a graveyard from the battlefield, a creature or planeswalker that is exiled instead doesn't “die.” Abilities that would trigger when it dies won't trigger.
If Spirit-Sister's Call leaves the battlefield, the replacement effect continues to apply. If one of the permanents it returned would leave the battlefield, it'll be exiled instead.
