Serrated Arrows is a common Artifact card from Pro Tour Collector Set (PTC), collector number et110sb. Current market price: $0.99, TCGplayer market prices via Scryfall.
This artifact enters with three arrowhead counters on it. At the beginning of your upkeep, if there are no arrowhead counters on this artifact, sacrifice it. {T}, Remove an arrowhead counter from this artifact: Put a -1/-1 counter on target creature.