I know this seems too good to be true but;
{Bioshift} + {Corpsejack Menace}
Would moving counters also double them?
Yes it would double them. {Bioshift} removes the counter from one creature and PLACES then on another. The ability for {Corpsejack Menace} says if one or more counters are PLACED on a creature you control, twice that many counters are placed.
Ex: You have {Elusive Krasis} with 3 +1/+1 counters one it and use {Bioshift} to move them to a {Fathom Mage} well thanks to the ability of {Corpsejack Menace} you would place 6 counters on the Fathom Mage instead of 3.
Excellent, is there any other way in standard to move counters around using RGB (jund) colors?