Is Geistchanneler legal in Standard, Modern, and Commander?

Geistchanneler is legal in: Historic.

Geistchanneler

Q: What type of card is Geistchanneler?

Geistchanneler is a Creature — Human Wizard. Its oracle text reads: "When this creature enters, choose an instant or sorcery card in your hand with mana value 3 or greater. It perpetually gains "This spell costs {2} less to cast." Power/Toughness: 1/3"

Creature — Human Wizard

When this creature enters, choose an instant or sorcery card in your hand with mana value 3 or greater. It perpetually gains "This spell costs less to cast."