So I'm thinking of experimenting with large deepstriking wych blobs, and I am wondering if you can use the hyperstimm backlash and/or architects of pain stratagems in the same turn the units deep strike. Now I know both of these stratagems happen "at the beginning of the battle round", and that deep strikers are not placed until "the end of the movement phase". However, both stratagems state that you "choose a unit from your army". Nothing says pick a unit on the battlefield, or has any wording specifically stating you cannot use this stratagem on a unit waiting to deloy. The wording in particular makes me think it is allowed, choose a unit in your army is pretty general. Maybe I'm missing something though.
It's not terribly likely I'd be using one of these strats often on a unit that could very well not make it to cc, but I am curious whether it's allowed at all or not.
The Night is Dark and Full of Terrors...