Your search for "Selfless Samurai 312" revealed the following:
Selfless Samurai - Samurai Showcase (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Ishikawa Kenta Card Text:Whenever a Samurai or Warrior you control attacks alone, it gains lifelink until end of turn.Sacrifice Selfless...
Selfless Samurai - Samurai Showcase (Foil) (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Ishikawa Kenta Card Text:Whenever a Samurai or Warrior you control attacks alone, it gains lifelink until end of turn.Sacrifice...