Items that Karma Scissors work on

On a slightly related note: Cape for Cold Protection is untradable now.
I assume that Shoes for Spikes is likewise.

I see a tradeBlock for it in the data, so yeah, Shoes for Spikes is untradeable.

EDIT: In regards to the OP, after a bit of digging...

The String mentioning the Karma Scissors isn't found in String.wz with the item's name, like item descriptions normally would, such as the Lunch Box's or the Mark of Naricain's.

The Zakum Helmet (1) has a tag tradeAvailable on it. It also has a tradeBlock tag (obviously) so there's definitely something going on there.

Mark of Naricain, Lunch Box (Lv 120) and the Ludibrium Cape do not have tradeAvailable. They have tradeBlock, tradeBlock, and quest tags respectively though.

And yes, deductive reasoning would give the conclusion that you can't trade Mark of Naricains during this patch at least, even with the Karma Scissors.