Historical Rules · 8 March 2024
Rule 702.43a
Official source text from the 8 March 2024 Rules release
Modular represents both a static ability and a triggered ability. “Modular N” means “This permanent enters the battlefield with N +1/+1 counters on it” and “When this permanent is put into a graveyard from the battlefield, you may put a +1/+1 counter on target artifact creature for each +1/+1 counter on this permanent.”