Serrated Arrows is a special Artifact card from Time Spiral Timeshifted (TSB), collector number 114. Current market price: $0.31 (foil $7.45), 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.