Extremely overpowered. 100
(which, by the way, isn't hard to get with Fractal Pests or even regular pest decks) means instant kill. Even if you don't want to go for the OTK, you can get a quick EM with a handful of
and
. Oh right, and this is just the unupped version. Upgraded, you only need 50
for the OTK and 50
for a guaranteed EM. The permanent isn't even expensive.
I say scrap the "Use multiple times per turns" bit, and balance from there.