Burrog Befuddler 
Creature — Frog Wizard
Flash (You may cast this spell any time you could cast an instant.) When this creature enters, target creature an opponent controls gets -1/-0 until end of turn.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL