Since there the possibility to PermaClog quick enough is non-existant, perhaps I was seeing something else. Like certain shield a weapon slots.
Since immaterial shields can't be targeted, the only way to get rid of them is by playing a shield on top of them. Deliver would forcibly play the target permanent on your opponent's side, thus giving a way around Hope and Jade Shields, not counting PA'd Shields. The same goes for weapons.