Is Generator Servant legal in Standard, Modern, and Commander?

Generator Servant is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

What type of card is Generator Servant?

Generator Servant is a Creature — Elemental. Its oracle text reads: "{T}, Sacrifice this creature: Add {C}{C}. If that mana is spent on a creature spell, it gains haste until end of turn. (That creature can attack and {T} as soon as it comes under your control.)"

Generator Servant

Creature — Elemental

, Sacrifice this creature: Add . If that mana is spent on a creature spell, it gains haste until end of turn. (That creature can attack and as soon as it comes under your control.)