Is Harnessed Lightning legal in Standard, Modern, and Commander?

Harnessed Lightning is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Harnessed Lightning?

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

Harnessed Lightning

Instant

Choose target creature. You get (three energy counters), then you may pay any amount of . Harnessed Lightning deals that much damage to that creature.