0% Chance, 0% Luck but 100% Faith! Imagine if following happens...
Or could be Umtiti Magic..

I will never rule out Messi magic, if things start and he has one of the better performances...sky is the limit. Quite sure Umtiti magic is not happening though

For me the problem for Barca is not even scoring those 4 goals, it will be much harder to keep their net clean. Only real chance for me is if PSG decides to go super defensive and defend lead from the first game and then after they are 0:2 the panic starts to rise and it gets difficult to start playing. Don't expect them to be that stupid though.
Guys please don't raise my hopes up so high. I know we've done it before and the good news is we actually do it when we are down, and seeing us do this twice now in the Copa del Rey makes me think maybe it can happen.
No harm to hope, but as long as we go to win big and score, I can live with myself. We're 3.5x to win so who knows?
Okay then let me lower your hopes. Pique isn't fit to play against PSG. So, center back duo will be Lenglet and Umtiti or Lenglet and Mingueza. RIP Barca!