When this creature dies, return any number of other creature cards with total power X or less from your graveyard to the battlefield, where X is this creature's power. Exile this card.
Moorland Rescuer's ability uses the power Moorland Rescuer had when it was last on the battlefield, not its power in the graveyard.
2021-09-24 • wotc
If Moorland Rescuer is exiled from its owner's graveyard in response to its triggered ability, the creature cards will still be returned to the battlefield.