Is Relic Amulet legal in Standard, Modern, and Commander?

Relic Amulet is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Relic Amulet?

Relic Amulet is an Artifact. Its oracle text reads: "Whenever you cast an instant, sorcery, or Wizard spell, put a charge counter on this artifact. {2}, {T}, Remove all charge counters from this artifact: It deals that much damage to target creature."