Is Thought Gorger legal in Standard, Modern, and Commander?

Thought Gorger is legal in: Modern, Legacy, Vintage, Commander.

Thought Gorger

Q: What type of card is Thought Gorger?

Thought Gorger is a Creature — Horror. Its oracle text reads: "Trample When this creature enters, put a +1/+1 counter on it for each card in your hand. If you do, discard your hand. When this creature leaves the battlefield, draw a card for each +1/+1 counter on it."