This is a mash up of “shooting fish in a barrel” (easy action with guaranteed success) and “all your ducks in a row” (getting everything in order), submitted by a loyal follower, the TruroTattler. Given the enormous amount of google hits, this is a common malaphor, as ducks appear to be as easy a target as fish. Also shooting mechanical ducks in a penny arcade shooting gallery is certainly playing on the mind in this one.
This is a mix-up of “lining up your ducks in a row” and “all your eggs in one basket”. Since ducks lay eggs, does the mind want to “scramble” eggs and ducks?