Is Frost Titan legal in Standard, Modern, and Commander?

Frost Titan is legal in: Modern, Legacy, Vintage, Commander, Historic.

Frost Titan

Q: What type of card is Frost Titan?

Frost Titan is a Creature — Giant. Its oracle text reads: "Whenever this creature becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}. Whenever this creature enters or attacks, tap target permanent. It doesn't untap during its controller's next untap step. Power/Toughness: 6/6"