Each creature you control can't be blocked by more than one creature.
Legalities
Not Legal
Standardbrawl
Brawl
Penny
Future
Modern
Pauper
Alchemy
Pioneer
Historic
Standard
Gladiator
Oldschool
Historicbrawl
Paupercommander
Explorer
Timeless
Legal
Duel
Legacy
Vintage
Commander
Premodern
Predh
Oathbreaker
Rulings
2004-10-04
When combined with an effect that reads “Each creature you control can’t be blocked except by two or more creatures,” none of your creatures can be blocked.