Magpie Runner Ducks

[iheartrunners]

I'd like to breed some magpie coloured Indian runners. I've been fooling around with the genetics calculator but thought I'd ask for some advice from those who have more experience with genetics and breeding. Which colour crosses yield the highest chance of magpie? I'm open to black or blue magpie colouring.

I have several runners now, but am planning to expand the flock this spring and I'm trying to figure out all the colours I'd like to get and which I'd need for certain colour "experiments".

Thanks!