Is Merfolk Thaumaturgist legal in Standard, Modern, and Commander?

Merfolk Thaumaturgist is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Merfolk Thaumaturgist

Q: What type of card is Merfolk Thaumaturgist?

Merfolk Thaumaturgist is a Creature — Merfolk Wizard. Its oracle text reads: "{T}: Switch target creature's power and toughness until end of turn. *"Blasted fishtails! It's not enough that they meddle with my head, but they twist my body as well." —Tahngarth of the *Weatherlight** Power/Toughness: 1/2"