Is Riddle Gate Gargoyle legal in Standard, Modern, and Commander?

Riddle Gate Gargoyle is legal in: Modern, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Riddle Gate Gargoyle?

Riddle Gate Gargoyle is an Artifact Creature — Gargoyle. Its oracle text reads: "Flying When this creature enters, you get {E}{E}{E} (three energy counters). Whenever you attack, you may pay {E}{E}. When you do, target creature you control gains lifelink until end of turn."