Hedron Blade is a common Artifact — Equipment card from Battle for Zendikar (BFZ), collector number 224. Current market price: $0.08 (foil $0.10), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1. Whenever equipped creature becomes blocked by one or more colorless creatures, it gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)