Is Stronghold Confessor legal in Standard, Modern, and Commander?

Stronghold Confessor is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Stronghold Confessor?

Stronghold Confessor is a Creature — Human Cleric. Its oracle text reads: "Kicker {3} (You may pay an additional {3} as you cast this spell.) Menace (This creature can't be blocked except by two or more creatures.) If this creature was kicked, it enters with two +1/+1 counters on it."