Zabaz, the Glimmerwasp

Jun 18, 2021 · If this creature gets enough -1/-1 counters put on it to cause it to go to the graveyard, modular will put a number of +1/+1 counters on the target artifact creature equal to the number of +1/+1 counters on this creature before it left the battlefield.

Jun 18, 2021 · Zabaz the Glimmerwasp's replacement effect requires it to be on the battlefield to work. Notably, that means it won't increase the counters given by its own modular ability.