Is Mindless Automaton legal in Standard, Modern, and Commander?

Mindless Automaton is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Mindless Automaton?

Mindless Automaton is an Artifact Creature — Construct. Its oracle text reads: "This creature enters with two +1/+1 counters on it. {1}, Discard a card: Put a +1/+1 counter on this creature. Remove two +1/+1 counters from this creature: Draw a card."