A-Ancestral Katana (NEO-A-1) [Kamigawa: Neon Dynasty]

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.)