Is Torch Song legal in Standard, Modern, and Commander?

Torch Song is legal in: Legacy, Vintage, Commander.

What type of card is Torch Song?

Torch Song is an Enchantment. Its oracle text reads: "At the beginning of your upkeep, you may put a verse counter on this enchantment. {2}{R}, Sacrifice this enchantment: It deals X damage to any target, where X is the number of verse counters on this enchantment."