A-Ancestral Katana is a common Artifact — Equipment card from Kamigawa: Neon Dynasty (NEO), collector number A-1.
Whenever a Samurai or Warrior you control attacks alone, you may pay {1}. When you do, attach Ancestral Katana to it. Equipped creature gets +2/+2 and has "This creature has first strike as long as it's attacking." Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)