You need answers for all types of permanents and have only so much room for removal, so flexible removal that can deal with multiple types of threats is crucial
(Once harnessed, its ability is active.) - At the beginning of your end step, exile up to one other target nonland permanent you control, then return that card to the battlefield under its owner's control
Kicking off the multicolor cards, Astor, Bearer of Blades, gives us a solid role player in decks using vehicles or equipment
Warp, foretell, cascade, and Adventures all cast from exile, and with three colours Ghost-Spider has more than enough cards available to it to get nice and big before it attacks
Rough asks
It works best in flicker shells that use it as a card draw engine in addition to interaction