Is Gate Colossus legal in Standard, Modern, and Commander?

Gate Colossus is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Gate Colossus?

Gate Colossus is an Artifact Creature — Construct. Its oracle text reads: "This spell costs {1} less to cast for each Gate you control.This creature can't be blocked by creatures with power 2 or less.Whenever a Gate you control enters, you may put this card from your graveyard on top of your library."

Gate Colossus

Artifact Creature — Construct

This spell costs less to cast for each Gate you control.<br>This creature can't be blocked by creatures with power 2 or less.<br>Whenever a Gate you control enters, you may put this card from your graveyard on top of your library.