Looking a lot better on the black-screening, and it seems like coins are no longer going missing (maybe? I think?) So that's really good!
On the other hand, Mean Dagger isn't discarding, or using actions, or even returning to hand (but is damaging the player as expected. Would be nice to know exactly how the self-damage worked, too...). It does seem to return to hand at the end of turn, though.
Edit: No luck on the disappearing coins, actually. Ah well.