I have not as yet ever seen a credit card that will give you SC (Status Credits), for those only way to get is when you fly.
FF points, now a second to me, yes, credit card companies will give you a lot of that, just for signing up or for spending.
Waffle it is, I am sure, SC/FF points, meaningless to most, but I have had a taste of it, and will try to/have to retain both Silvers with VA and QF, and my reading of it, is that the only way to get this, is to fly with either of the 3 airlines in Australia that will give you SC.
But of course, your magic might work, and you find a credit card that will give you SC. I certainly couldnt.
CNS - BNE with VA in J - 60 SC $$$
BNE - AKL with NZ in J - 60 SC $$$$
AKL - SYD with NZ in - J - 60 or FlexY 30 SC
SYD - CNS with VA FlexY - 20
Assuming you live in CNS.
First calculate the miles flown, then refer to how many SC you earn in the "right class".