Marketback Walker is a rare Artifact Creature — Construct card from Aetherdrift (DFT), collector number 498. Current market price: — (foil $4.67), TCGplayer market prices via Scryfall.
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.