The card is neither destroyed nor sacrificed
Circling back to TAUC costs, you could argue its actually even closer to free than other alternate costs: life points and cards in hand are expendable resources, and (at least for drawing cards) somewhat expensive to replenish
You were then allowed to cast the exiled card whenever, including during your second main phase
If you don't control an Army, create a 0/0 black Zombie Army creature token first.) Sorcery Glamdring Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard
Cursed Mirror catches any relevant ETB effects upon hitting the battlefield, and it doesn't take much to get extra value out of it
The victims die by initially mysterious causes, which later turn out to be a tormented spirit that emerges from a TV screen to essentially scare its victims to death