The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
A good legendary certainly helps, but I don't think they make that much of a difference. I just checked my run history, and only 8 out of 44 full clears I have recorded included a legendary in the deck. That works out to about 20%. IMO, the most important thing in Forge is just being able to play on curve. I feel like most of my losses come down to either power issues, or simply getting high rolled by a god tier AI deck.
I see you added some of your runs to the database, so thank you for sharing your results too!
I see you added some of your runs to the database, so thank you for sharing your results too!