Would {Corpsejack Menace} double the number of counters moved with {Bioshift}?
Me thinks it would.
It sure does! Give me a second to bust out the ruling for you.
And here's your ruling, from Gatherer:
1/24/2013 To move a counter from one creature to another, the counter is removed from the first creature and placed on the second. Any abilities that care about a counter being removed or placed on a creature will apply.
RESOLVED
Ssuuuwwwhhheeettttt! BUG here I come!!
Thanks Keyeto!