Dockworker Drone

Dockworker Drone’s second ability puts all counters that were on Dockworker Drone onto the target creature, not just its +1/+1 counters.

If enough -1/-1 counters are put on Dockworker Drone at the same time to make its toughness 0 or less, its second ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and an equal number of each of those types of counters (plus any other applicable counters) will be put onto the target creature.

In some unusual cases, you may end up putting the appropriate counters on more than one permanent. For example, if you control The Ozolith (a card from the Ikoria: Lair of Behemoths set) when Dockworker Drone dies, you’ll put the appropriate number of each kind of counter onto both The Ozolith and the target creature.