When this creature enters, green creatures get -1/-1 until end of turn.
Legalities
Legal
Duel
Penny
Predh
Legacy
Vintage
Commander
Premodern
Oathbreaker
Not Legal
Brawl
Future
Modern
Pauper
Alchemy
Pioneer
Explorer
Historic
Standard
Timeless
Gladiator
Oldschool
Standardbrawl
Paupercommander
Penny
Rulings
2004-10-04
The -1/-1 penalty is given to all green creatures on the battlefield when the triggered ability resolves. It will not apply to green creatures that enter later in the turn.