Is Companion of the Trials legal in Standard, Modern, and Commander?

Companion of the Trials is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Companion of the Trials

Q: What type of card is Companion of the Trials?

Companion of the Trials is a Creature — Bird Soldier. Its oracle text reads: "Flying {1}{W}: Untap target creature. Activate only if you control a Gideon planeswalker. *"The fiercest loyalties are earned in battle." —Gideon Jura* Power/Toughness: 2/2"