Failed Conversion

The five-mana price is the whole tension. As a shrink-to-death Aura, -4/-4 kills almost anything worth killing, but Auras carry a structural risk that removal spells do not: if the target is removed in response to the cast, the Aura resolves with nothing to enchant and goes straight to the graveyard, the mana spent for nothing and the death trigger never firing. Black has long paid a premium for Aura-based removal to offset that fragility, and the design here answers the sunk-cost problem with a consolation clause. The surveil fires specifically on the enchanted creature's death, which quietly rewards the intended sequence: attach, let the -4/-4 do its work, and collect the dig as the creature falls. That timing is the point. The card gives you nothing when it whiffs and nothing when it merely sits on a board stall; it pays out only in the case where the removal actually connected and the body hit the yard. What you are buying at five mana, then, is not raw efficiency but a kill-plus-payoff: a hard answer to most bodies with a graveyard-feeding self-mill stapled to the successful outcome, built for a deck that wants creatures in its graveyard as much as off the battlefield.