I don't want to stop you from playing cards you like. I do however want this thread to be a place for serious discussions about UR Delver without recurring questions about mediocre card choices.
Price of Progress is a really good card in many matchup, especially considering the high amount of duals and utility lands in the decks to beat. The downside of it is that you will almost always suffer 2-4 dmg too and that your opponent will try to play around it, once he has seen it. So PoP often gets boarded out after G1.
I am currently trying 2 in the MD myself (possible 3rd) to make use of it while lessening the amount of dead draws (it's just a dead card against e.g. Spiral Tide).
You have to find the right mixture for your meta though.

