Joven's Ferrets 
Creature — Ferret
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL