Is Qarsi Deceiver legal in Standard, Modern, and Commander?

Qarsi Deceiver is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Qarsi Deceiver

Q: What type of card is Qarsi Deceiver?

Qarsi Deceiver is a Creature — Snake Wizard. Its oracle text reads: "{T}: Add {C}. Spend this mana only to cast a face-down creature spell, pay a mana cost to turn a manifested creature face up, or pay a morph cost. (A megamorph cost is a morph cost.)"

Creature — Snake Wizard

: Add . Spend this mana only to cast a face-down creature spell, pay a mana cost to turn a manifested creature face up, or pay a morph cost. (A megamorph cost is a morph cost.)