Yes, you can cast this targeting your opponent’s Walls to good effect.
Cast this spell only after combat.
Destroy all creatures that were blocked by target Wall this turn. They can't be regenerated. For each creature that died this way, put a creature card from the graveyard of the player who controlled that creature the last time it became blocked by that Wall onto the battlefield under its owner's control.
First place all the affected creatures in the graveyard, then choose the appropriate number of creatures from the attacker’s graveyard and put them onto the battlefield. Some or all of them may be the same creatures which were just destroyed.
