Is Dragonspark Reactor legal in Standard, Modern, and Commander?

Dragonspark Reactor is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Dragonspark Reactor?

Dragonspark Reactor is an Artifact. Its oracle text reads: "Whenever this artifact or another artifact you control enters, put a charge counter on this artifact. {4}, Sacrifice this artifact: It deals damage equal to the number of charge counters on it to target player and that much damage to up to one target creature."

Dragonspark Reactor

Artifact

Whenever this artifact or another artifact you control enters, put a charge counter on this artifact.

, Sacrifice this artifact: It deals damage equal to the number of charge counters on it to target player and that much damage to up to one target creature.