Is Preacher legal in Standard, Modern, and Commander?

Preacher is legal in: Legacy, Vintage, Commander.

What type of card is Preacher?

Preacher is a Creature — Human Cleric. Its oracle text reads: "You may choose not to untap Preacher during your untap step.{T}: For as long as Preacher remains tapped, gain control of target creature of an opponent's choice they control."

Preacher

Creature — Human Cleric

You may choose not to untap Preacher during your untap step.<br>: For as long as Preacher remains tapped, gain control of target creature of an opponent's choice they control.