this deck is all about getting free stuff.
Clockwork Gnome gives spare parts and is an annoying one drop, Unstable Portal gives you something cheap at random, i have gotten 1 cost Chillwind Yeti and 2 cost voljins from mine. Micro Machine will keep growing unless they kill it, in which case they waster something on a 2 drop. Duplicate gives you more value out of whatever card you have out.
Echo of Medivh is another more from the value cards card, and everything else is stuff for sheer midrange value and duplication/echoing.