Invisible Force Field

Four permanents, twice: that is the shape of this protection spell, and rebound is what splits one defensive trick into two plans that answer different problems. Indestructible does its familiar work here, blanking damage and destroy effects while leaving permanents open to exile, bounce, and sacrifice, so the four-target cap rewards a board dense with permanents worth spreading the grant across rather than a single fragile threat. What sharpens the design is rebound's rigid timing. The first cast is fully reactive: you hold it at instant speed against a sweeper and hope enough of your four picks survive to matter. The free recast, though, resolves on your following upkeep, and because the grant expires at end of turn, it can only ever cover your own turn. It still guards against an opponent's responses; it just does so on your terms, not theirs: attacks that walk into blocker-side removal, a planeswalker's loyalty activation you want to protect, a sacrifice engine you would rather not see answered mid-combo. So the two halves point in opposite directions. The reactive cast saves your board from someone else's mass removal on their turn; the free cast insulates your own board actions a turn later. When no sweeper materializes, the reactive value simply evaporates, and you are left with an upkeep's worth of indestructible you may not need. It is protection built for grindy, removal-heavy games, paying off when the first cast lands on the right permanents and the recast finds work to do.