Haunted Baby Carriage

Sacrifice a creature. Then, put a +X/+Y counter on target creature where X is the sacrificed creature's power and Y is the sacrificed creature's toughness.
As time passes, the subject will begin to weaken and their body will begin to degrade, while SCP-382-1 slowly begins to take on a new, shinier appearance; rust will begin to flake off, the rubber wheels will become more supple, and a velvet cushion will appear inside.