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Whenever this creature attacks, it gets +0/+2 until end of turn.
At end of combat, tap all creatures that blocked this creature this turn. They don't untap during their controller's next untap step.
The second ability doesn’t track the creatures’ controllers. If an affected creature changes controllers before its old controller’s next untap step, Joven’s Ferrets will prevent it from being untapped during its new controller’s next untap step.