If all the attacking creatures attack your planeswalkers, you can’t cast Heavy Fog. To cast it, a creature needs to have attacked _you_.
2009-10-01
wotc
Heavy Fog prevents only damage that would be dealt to you by attacking creatures. It won’t prevent damage attacking creatures would deal to creatures or planeswalkers you control.
2009-10-01
wotc
Heavy Fog prevents all damage attacking creatures would deal to you this turn, not just combat damage. Noncombat damage from those creatures is prevented only if they’re still attacking at the time that damage would be dealt or, if the creature has left the battlefield by then, if it was an attacking creature at the time it left.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Legal
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