hmmm... If this is meant purely as a counter to sacrifice tactics, I think you may need to drop attack to -2. Otherwise, it wil backfire if eclipse is in play.
Also, SoPa could be heavily abused. Particularly given the stacking... It would take a trio, but:
This + cat + SoPa... You would end up being able to outpace a malignant cell's growth rate I think.
The SoPa would then quickly grow the total damage output... Not sure how it compares with Patient Sparktal, but could give it a run for its money.
Abuse potential of the implementation aside, I do like the sacrifice effect counter idea.