Can I rebound a spell that exiles itself?

Question

There's a handful of cards from the game which also exile themselves as they resolve. For a straightforward example there's Restock:

Return two target cards from your graveyard to your hand. Exile Restock.

That's fine enough. But what if I have Cast Through Time on the battlefield to give it rebound?

Instant and sorcery spells you control have rebound. (Exile the spell as it resolves if you cast it from your hand. At the beginning of your next upkeep, you may cast that card from exile without paying its mana cost.)

Will Restock rebound out of exile?

There doesn't seem to be a ruling about this on Cast Through Time. The one part I'm confident about is that if it does rebound, it won't rebound a second time -- it'll exile itself again and it won't have been cast from my hand that time.

Answer 1

No, spells that exile themselves will not rebound.

This is supported by the definition of Rebound in the comprehensive rules: (emphasis mine)

702.87a Rebound appears on some instants and sorceries. It represents a static ability that functions while the spell is on the stack and may create a delayed triggered ability. “Rebound” means “If this spell was cast from your hand, instead of putting it into your graveyard as it resolves, exile it and, at the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.”

Rebound works by putting the card into exile instead of putting it into your graveyard after the spell is finished resolving. A card that exiles itself never goes into the graveyard, so Rebound dosen't have a chance to move it, and give you the chance to cast it for free at your next upkeep.

Answer 2

According to several sources (see below), you won't get to cast it again. I'm quoting an explanation very fitting from Cranial Insertion:

It won't rebound. Rebound works by replacing the normal process of going to the graveyard after the spell is done resolving with exiling and setting up a delayed trigger. But that never happens with spells that exile themselves, because they do their exiling as part of resolving them. The spell never gets to the point where the game would try to put it into the graveyard, so the rebound never happens.

The important thing to understand with both rebound and unearth isn't really where the card is going. What's important is what's putting it there. The rebounded spell doesn't come back because what's putting it in exile is the spell's own exile-it-forever effect. A flickered unearth creature will come back because what's putting it in exile is the flicker's exile-and-bring-it-back effect.

In that sense, it appears that the ruling on Cast Through Time quoted in the question doesn't apply to "zone other than exile", but "zone other than the graveyard".

Other sources:

• tappedout.net
• Matt Tabak's Twitter: "So yes, you can technically give Temporal Trespass rebound, but it won't work."

Answer 3

No

Ruling from mtg Gamepedia:

If a spell moves itself into another zone as part of its resolution (as Arc Blade, All Suns' Dawn, and Beacon of Unrest do), rebound won't get a chance to apply

Moreover, the card exiling itself is part of the resolution, so Cast Through Time will no longer be giving it Rebound when Rebound would trigger, as the card is already exiled.