Is Undergrowth legal in Standard, Modern, and Commander?

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

Undergrowth

Q: What type of card is Undergrowth?

Undergrowth is an Instant. Its oracle text reads: "As an additional cost to cast this spell, you may pay {2}{R}.Prevent all combat damage that would be dealt this turn. If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures."

Instant

$0.14 ↗2 similarCommander, Legacy

As an additional cost to cast this spell, you may pay .<br>Prevent all combat damage that would be dealt this turn. If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures.