Bone Sabres - 88 R 40K

Whenever equipped creature attacks, put four +1/+1 counters on it.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
Charged with psychic energy, the melee weapons of the Tyranid are far more than bone and chitin.
rare
Artifact — Equipment
From the Magic: The Gathering set Warhammer 40,000 Commander.