Is Vodalian Knights legal in Standard, Modern, and Commander?

Vodalian Knights is legal in: Legacy, Vintage, Commander.

Vodalian Knights

Q: What type of card is Vodalian Knights?

Vodalian Knights is a Creature — Merfolk Knight. Its oracle text reads: "First strikeVodalian Knights can't attack unless defending player controls an Island.When you control no Islands, sacrifice Vodalian Knights.{U}: Vodalian Knights gains flying until end of turn."

Creature — Merfolk Knight

First strike<br>Vodalian Knights can't attack unless defending player controls an Island.<br>When you control no Islands, sacrifice Vodalian Knights.<br>: Vodalian Knights gains flying until end of turn.

Set Fallen Empires

Rarity Rare

Artist Susan Van Camp