Is Paladin of Prahv legal in Standard, Modern, and Commander?

Paladin of Prahv is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Paladin of Prahv?

Paladin of Prahv is a Creature — Human Knight. Its oracle text reads: "Whenever this creature deals damage, you gain that much life. Forecast — {1}{W}, Reveal this card from your hand: Whenever target creature deals damage this turn, you gain that much life. (Activate only during your upkeep and only once each turn.)"

Paladin of Prahv

Creature — Human Knight

Whenever this creature deals damage, you gain that much life.

Forecast — , Reveal this card from your hand: Whenever target creature deals damage this turn, you gain that much life. (Activate only during your upkeep and only once each turn.)