Fluttershy 1538 (Secret Lair Drop Series)

Defender, flying {1}, {T}: Put a +1/+1 counter on each creature with a tail target player controls. Stare down up to one target creature until end of turn. (It can't attack or block as long as you're looking directly at it.)

NM - $49.20
LP - $39.30
MP - $29.50
HP - $19.70
DMG - $9.90