Day 4:
Rats: A cantrip trasher for $4. Pretty nice, huh. Except if it's your only source of trashing it really is just going to spread through your deck like a plague (har har), and you'll be left with either a lot of dead cards or trashing everything good. There's probably a way you can play with fire here- Bishop is the first thing that comes to mind- but my first impression is that you're likely to get burned pretty often if you go Rats. Definitely looks like it needs some other source of trashing to be viable, and if you have other trashing that makes it less attractive in the first place. My first impression is therefore that this is probably really weak, but it could infrequently usable be part of a coordinated trashing strategy with something that doesn't hit Copper, say (Hermit!), and then ends up spending most of its Actions keeping the rat problem in check. Which could work, but also could be more trouble than it's worth.
Pillage: Targeted discard! And the way to balance it is to make it a one-shot, that's actually kind of brilliant. At this point Donald is just pretty clearly f***ing with us. Tomorrow's preview is goin g to include a cantrip Moat, you heard it here first. Now, a one-shot $5 is hard to go for even if the shot is nasty, so it seems to include Spoils as a way to rebalance it. The combined effect of one-shot targeted discard, with an aftereffect of two Golds in your next pass through, is that this looks like something that's going to be great for Big Money decks playing versus an engine. Knock out your opponents' key card, and get a one-time cash infusion sure to be good for a Province or two.
But it does nothing for you the turn you play it, which is more often than not the hallmark of a weak attack (Saboetur, Bureaucrat). A nasty, nasty card whose power level I am very unsure of.
Spoils: Now, see, it would've been great if Feodums counted Spoils. Though you'd have to store them up and not use them then. I wonder if all the Spoils-giving cards are one-shots that give Spoils to provide recompense for their fleeting nature, or if one of them gets you a Spoils and sticks around. That might make it easier to run this pile out. Obviously most decks will be thrilled to add some Spoils to their warchest, but relying on Spoils as your primary source of income could lead to nasty over-greening problems after they're gone.
Now to see what others have said.