Selfless Samurai is a uncommon Creature — Fox Samurai card from Kamigawa: Neon Dynasty (NEO), collector number 312. Current market price: $0.25 (foil $0.24), TCGplayer market prices via Scryfall.
Whenever a Samurai or Warrior you control attacks alone, it gains lifelink until end of turn. Sacrifice this creature: Another target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)