Too much focus on the card text itself and making comparisons to cards like scorch. Yes, the card reads “this costs 1” for outcast. That’s great. It works exactly like scorch in outcast. No one is disputing that.
The question is, was this intended to conflict with card discounts?
If the card was released at “This costs 1” in outcast, there wouldn’t be an issue. But the fact that the text read “this costs 0” and a hasty nerf changed it to “this costs 1” and suddenly creates a conflict with outcast and mana discounts, you have to question whether this was intended. There is no way that it is, in my opinion. Without confirmation from the devs, we won’t know for absolute certain.