Arkham Asylum

{t}: Add {c}
{4}{w}{t}: Exile target Villain until Arkham Asylum
leaves the battlefield. This ability costs {2} more
for each creature exiled with it.
{8}{t}: Exile Arkham Asylum and return
it under its owners control tapped. This ability
costs {2} less for each creature exiled
with it. Any player may activate this ability.