Is Rakdos Guildmage legal in Standard, Modern, and Commander?

Rakdos Guildmage is legal in: Modern, Legacy, Vintage, Commander.

Rakdos Guildmage

Q: What type of card is Rakdos Guildmage?

Rakdos Guildmage is a Creature — Zombie Shaman. Its oracle text reads: "({B/R} can be paid with either {B} or {R}.) {3}{B}, Discard a card: Target creature gets -2/-2 until end of turn. {3}{R}: Create a 2/1 red Goblin creature token with haste. Exile it at the beginning of the next end step."