I posted my thoughts on the Scavenger/Stash combo in another thread:
Scavenger/Stash is something that we didn't play with, but Turambar and I talked about it and it seems super-strong. Get 2 Scavengers and 3 Stashes and you can Province every turn regardless of cursing, looting, trashing, or deck-mucking attacks. Honestly, probably way better than Chancellor/Stash, which was good already. The only failure mode is if your 2nd Scavenger ends up being the 5th card of your deck, which has a miniscule probability of happening.
Assuming optimal shuffle luck on 4/3 with Scavenger/Silver opening:
Turn 3: play $4, buy Scavenger
Turn 4: play Scavenger (topdecking other Scavenger), play $5, buy Stash
Turns 5 and 6: play Scavenger (topdecking other Scavenger), play $5, buy Stash
Turns 7 through 14: buy Province
As long as you don't draw your second Scavenger in your hand. Buying a third Scavenger or fourth Stash should prevent that from happening.