Is Harvest Mage legal in Standard, Modern, and Commander?

Harvest Mage is legal in: Legacy, Vintage, Commander, Pauper.

Harvest Mage

Q: What type of card is Harvest Mage?

Harvest Mage is a Creature — Human Spellshaper. Its oracle text reads: "{G}, {T}, Discard a card: Until end of turn, if you tap a land for mana, it produces one mana of a color of your choice instead of any other type and amount."

Creature — Human Spellshaper

, , Discard a card: Until end of turn, if you tap a land for mana, it produces one mana of a color of your choice instead of any other type and amount.