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Official rulings
2 rulings · in English, source ScryfallArcbound Tracker will consider spells you cast before it was on the battlefield. For example, if Arcbound Tracker is the first spell you cast in a turn, each subsequent spell you cast after it's on the battlefield will cause the last ability to trigger.
2021-06-18 · Wizards of the CoastIf 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.
2021-06-18 · Wizards of the CoastAll printings