Donatello, Mutant Mechanic
{T}: Put three +1/+1 counters on target artifact you control. If it isn't a creature, it becomes a 0/0 Robot creature in addition to its other types. Activate only as a sorcery. Whenever an artifact you control is put into a graveyard from the battlefield, if it had counters on it, put those counters on up to one target artifact or creature you control.
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Official rulings (6) · Scryfall
If the target artifact is an attached Equipment, it becomes unattached. If an Equipment without reconfigure becomes an artifact creature, it can't be attached to another creature.
Donatello's first ability doesn't remove any abilities the target artifact has.
If the target artifact has station, its base power and toughness will be set to 0/0. Adding charge counters to that artifact won't restore the power and toughness printed in any of its striations.
The resulting artifact creature will be able to attack on your turn if it's been under your control continuously since the turn began. That is, it doesn't matter how long it's been a creature, just how long it's been on the battlefield.
The artifact retains any types, subtypes, or supertypes it has.
If the target artifact is a Vehicle, its base power and toughness will be set to 0/0. Crewing that Vehicle will not restore its power and toughness.