Is Silvergill Mentor legal in Standard, Modern, and Commander?

Silvergill Mentor is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Silvergill Mentor?

Silvergill Mentor is a Creature — Merfolk Wizard. Its oracle text reads: "As an additional cost to cast this spell, behold a Merfolk or pay {2}. (To behold a Merfolk, choose a Merfolk you control or reveal a Merfolk card from your hand.) When this creature enters, create a 1/1 white and blue Merfolk creature token."

Silvergill Mentor

Creature — Merfolk Wizard

As an additional cost to cast this spell, behold a Merfolk or pay . (To behold a Merfolk, choose a Merfolk you control or reveal a Merfolk card from your hand.)