Alison Cheney, Shalka Conduit

{r}{r}Sub-Sonic Training - Every time a counter is
placed by a spell you control on an opponent's spell,
you may add a second counter with the power and
toughness values switched. This ability deals one
damage to this creature's toughness each time it is activated.
Doctor's companion

I am not going to let you control me. Whatever
you are, I'm not your zombie!