Tinkering Tatterdemalion

When Tinkering Tatterdemalion enters the battlefield, each opponent creates a 1/1 black
Bird creature token with flying.
{x}{x}, {t}: Put X +1/+1 counters on target artifact
you control. If it isn't a creature or Vehicle, it
becomes a 0/0 Scarecrow artifact creature in
addition to its other types. It can attack this turn
as though it didn't have defender.