Blinding Fog
Instant
Prevent all damage that would be dealt to creatures this turn. Creatures you control gain hexproof until end of turn. (They can't be the targets of spells or abilities your opponents control.)
"I see you, shiny soldiers, but you won't see me."
Igor Kieryluk
Ixalan (XLN)
• #177Rulings
Blinding Fog prevents all damage that would be dealt to creatures, not just combat damage.
(wotc • 2017-09-29)
Damage that would be dealt to creatures that enter the battlefield later in the turn will also be prevented. However, creatures that come under your control later in the turn won’t gain hexproof.
(wotc • 2017-09-29)
Rulings
Blinding Fog prevents all damage that would be dealt to creatures, not just combat damage.
(wotc • 2017-09-29)
Damage that would be dealt to creatures that enter the battlefield later in the turn will also be prevented. However, creatures that come under your control later in the turn won’t gain hexproof.
(wotc • 2017-09-29)