Crystalline Crawler is a rare Artifact Creature — Construct card from Edge of Eternities Commander (EOC), collector number 133. Current market price: $0.33, 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.