Is Junk Golem legal in Standard, Modern, and Commander?

Junk Golem is legal in: Legacy, Vintage, Commander.

Junk Golem

Q: What type of card is Junk Golem?

Junk Golem is an Artifact Creature — Golem. Its oracle text reads: "This creature enters with three +1/+1 counters on it. At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it. {1}, Discard a card: Put a +1/+1 counter on this creature. Power/Toughness: 0/0"