Okay, Thanks for the article, kstreet. Will do calculation on it. That's a very good Google sheet but I see the rank used for calculation is Mythic only, My rank is mostly at Midnight Shadow - Auric Gold.
I think I need to ask PhoeniX-Skye if it's possible to change the rank. I hope I could reach Mythic with the new deck so no change will be needed for the calculation :)
I have good news for you. In the sheet, go to File -> Make a Copy. Once you do, you can edit the rank, too. In other words, you just don't have permission to edit the original, but you can do whatever you'd like to your copy.
Thank you very much for the explanation ktsreet, It works at my end. Much appreciate it