Crystalline Crawler is a rare Artifact Creature — Construct card from Commander Anthology Volume II (CM2), collector number 183. Current market price: $3.06, TCGplayer market prices via Scryfall.
Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it. Remove a +1/+1 counter from this creature: Add one mana of any color. {T}: Put a +1/+1 counter on this creature.