Soul Exchange is a uncommon Sorcery card from Fallen Empires (FEM), collector number 43. Current market price: $0.93, TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, exile a creature you control. Return target creature card from your graveyard to the battlefield. Put a +2/+2 counter on that creature if the exiled creature was a Thrull.