Jade - This is a mess. There is a cool idea in here, namely discarding a Duchy for Coins. But it needs to differ more (e.g. 4 Coins) from Provinces to really make you want to buy Duchies. 1 Coin more is not enough.
The Duration effect is unexciting. There needs to be a steeper step from 0 to 1 empty piles (I mean, for how many turns are two or more piles empty?). It is also not clear whether the Duration effects buffs or nerfs the card.
Renovate - This is better than Remake in three respects: non-mandatory trashing, up to 1 instead of precisely 1 and tokens instead of card gaining. That is simply too much (and also too automatic with Coppers and Curses). There is also the serious issues of Province milling which is far easier than e.g. with Transmogrify (you do not need several copies) and which could be amended via "differently named card costing...".
Strongbox - This is interesting. I am not a fan of "gain a Treasure to get a one-shot Treasure" but everything else about the card is pretty sweet. Also, nothing bonkers. We don't need another Rope or Tools.
Packhorse - You basically already pointed out everything. Not getting the token on play but on discard makes this shine.
Ride is a decent benchmark and as it is very weak (for $3 we get 2 cards via Experiment of Expedition) the card seems fine power-level wise.
Dollar - Pouch is weak but if it can hoard Buy tokens it has a right to exist. Are Buy tokens really that crazy that you have to limit it somehow? I am not sure, it could very well be the case, but I am not a fan of a limit. But perhaps I am misreading the card and it is just a scaling (1,1,1,5 Coins is on average 2) Silver?
Miners Lamp - Third token Pouch! I like the scaling here but not the blow-up option. Like with Dollar, that seems like a too severe punishment for token hoarding.
Optimization - This is a tricky one. I have a hard time to judge this but in Kingdoms without extra Buys this leads to interesting endgame decisions (do you waste a turn to get an extra Buy for DoubleProvince) so my hunch is that this is better than Exploration.
Winner:emtzalex with Packhorse - Sweet and simple with a classical feel and a little twist that pushes it from boring/mechanical to brilliant.
Runner-Ups:- Udzu with Dollar - Not love on first sight but a Pouch that can also be used as a build-up payload card with an average Coin yield of Silver does feel right.
- Will(ow|iam) with Optimization - Hey, it is like Exploration but better! How can this not be a gem.