Thanks for answering ! Actually, I've tried that (the every tick + inverting events), but nope, still the same problem.
The counter is equal to 0 at the beginning.
I die, the counter is now 1.
Layout restarts, the counter is 0 again. What the...
EDIT : Sorry, I was being autistic. There was a "set Deaths to 0" condition in my "On start of layout". WTF was I thinking at the moment. Thanks for the help !