Is Marketback Walker legal in Standard, Modern, and Commander?

Marketback Walker is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Marketback Walker

Q: What type of card is Marketback Walker?

Marketback Walker is an Artifact Creature — Construct. Its oracle text reads: "This creature enters with X +1/+1 counters on it. {4}: Put a +1/+1 counter on this creature. When this creature dies, draw a card for each +1/+1 counter on it. *Many of the inventions built to fight the Phyrexians have since been repurposed for civilian use.* Power/Toughness: 0/0"