Is Sanguine Soothsayer legal in Standard, Modern, and Commander?

Sanguine Soothsayer is legal in: Historic.

Sanguine Soothsayer

Q: What type of card is Sanguine Soothsayer?

Sanguine Soothsayer is a Creature — Bat Cleric. Its oracle text reads: "Flying, lifelink Whenever Sanguine Soothsayer attacks, conjure a card named Sanguine Bond into the top fifteen cards of your library at random. It perpetually gains "You may pay {0} rather than pay this spell's mana cost" and "When this permanent enters, draw a card." Power/Toughness: 2/1"

Creature — Bat Cleric

Flying, lifelink

Whenever Sanguine Soothsayer attacks, conjure a card named Sanguine Bond into the top fifteen cards of your library at random. It perpetually gains "You may pay rather than pay this spell's mana cost" and "When this permanent enters, draw a card."