I just played
this game. I open with a bit of an advantage on 5/2, and some pretty good early draws. My opponent makes the very reasonable-seeming transition into scheme-saboteur. Sure, sab might not be that great, but playing one every turn is much more appealing. So I counter this buy... using stash! And not just everything-on-top. I line it up so I have 5-card hand, stash, 5-card hand, stash, etc. etc. So every turn, he turns a stash into a silver. And my lead is totally preserved.
Just felt like posting this because people are always looking for ways of using stash creatively, and not just all-my-stashes-lined-up-atop-my-deck.