Is Aven Riftwatcher legal in Standard, Modern, and Commander?

Aven Riftwatcher is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Aven Riftwatcher

Q: What type of card is Aven Riftwatcher?

Aven Riftwatcher is a Creature — Bird Rebel Soldier. Its oracle text reads: "Flying Vanishing 3 (This creature enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.) When this creature enters or leaves the battlefield, you gain 2 life."

Creature — Bird Rebel Soldier

Flying

Vanishing 3 (This creature enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

When this creature enters or leaves the battlefield, you gain 2 life.

Set Time Spiral Remastered

Rarity Common

Mana Value 3

Artist Don Hazeltine

Collector # 6

Scryfall Gatherer