Is Warning legal in Standard, Modern, and Commander?

Warning is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Warning?

Warning is an Instant. Its oracle text reads: "Prevent all combat damage that would be dealt by target attacking creature this turn."

Instant

Prevent all combat damage that would be dealt by target attacking creature this turn.

Set Ice Age

Rarity Common

Artist Pat Lewis

Instant Commander Pauper Legacy