Stealth Bird
Group:Winged Beast/Effect
Type:Dark
Level:3
Icon:Deckmaster
ATK:700
DEF:1700
Whenver a level 3 monster is flipped over inflict 1000 life points to the opposing player's life points.(i.e. ur opponent flips a level 3 mon, u then lose 1000lp.u flip a level 3 mon, ur opponent loses 1000lp)

or this could be the effect:

Whenever a level 3 monster is flipped, both players lose 1000lp.

or this:
Whenever u flip a level 3 monster, ur opponent loses 1000lp and u lose 500lp.