I just read the Invest event. That seems insane, especially for its cost, although I suppose there is a self-limiting factor that Action cards that are especially popular you're less likely to want to Invest in.
It might make for a powerful combination with Looters, though. Invest in a Ruin, and every time someone gains a copy of that Ruin, you get +2 cards. Cultist + Invested Ruin could cause your deck to really explode, especially in multiplayer where the likelihood of that particular Ruin being gained by one of your opponents is higher