Is Galvanic Discharge legal in Standard, Modern, and Commander?

Galvanic Discharge is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Galvanic Discharge?

Galvanic Discharge is an Instant. Its oracle text reads: "Choose target creature or planeswalker. You get {E}{E}{E} (three energy counters), then you may pay any amount of {E}. Galvanic Discharge deals that much damage to that permanent."

Galvanic Discharge

Instant

Choose target creature or planeswalker. You get (three energy counters), then you may pay any amount of . Galvanic Discharge deals that much damage to that permanent.