Your search for "Selfless Spirit 706" revealed the following:
Selfless Spirit (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Seb McKinnon Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit (SOC) from Secrets of Strixhaven Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Seb McKinnon Card Text:FlyingSacrifice this creature: Creatures you control gain indestructible until end of turn.
Selfless Spirit - EMN Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Seb McKinnon Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit (Foil) (EMN) from Eldritch Moon, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Seb McKinnon Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit (J22) from Jumpstart 2022, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Seb McKinnon Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit - Prerelease Promo (Foil) (PEMN) from Eldritch Moon, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Seb McKinnon Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit - RCQ Promo (PRCQ) from Regional Championship Qualifiers 2022, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Justine Jones Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selfless Spirit - RCQ Promo (Foil) (PRCQ) from Regional Championship Qualifiers 2022, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Justine Jones Card Text:FlyingSacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.