Is Ragemonger legal in Standard, Modern, and Commander?

Ragemonger is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Ragemonger

Q: What type of card is Ragemonger?

Ragemonger is a Creature — Minotaur Shaman. Its oracle text reads: "Minotaur spells you cast cost {B}{R} less to cast. This effect reduces only the amount of colored mana you pay. (For example, if you cast a Minotaur spell with mana cost {2}{R}, it costs {2} to cast.) Power/Toughness: 2/3"

Creature — Minotaur Shaman

Minotaur spells you cast cost less to cast. This effect reduces only the amount of colored mana you pay. (For example, if you cast a Minotaur spell with mana cost , it costs to cast.)