Your search for "Professor's Warning 84" revealed the following:
Professor's Warning (STX) from Strixhaven: School of Mages, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Kieran Yanner Card Text:Choose one —• Put a +1/+1 counter on target creature.• Target creature gains indestructible until end of turn. (Damage...
Professor's Warning (Foil) (STX) from Strixhaven: School of Mages, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Kieran Yanner Card Text:Choose one —• Put a +1/+1 counter on target creature.• Target creature gains indestructible until end of turn....