Name: Professor's Warning Cost: B CMC: 1 Color: B CID: B Type: Instant Rules Text: Choose one -- - Put a +1/+1 counter on target creature. - Target creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.) Set/Rarity: Strixhaven: School of Mages common Legality: Legal in historic, Legal in paupercommander, Legal in vintage, Legal in commander, Legal in duel, Legal in brawl, Legal in timeless, Legal in pioneer, Legal in gladiator, Legal in pauper, Legal in legacy, Legal in modern, Legal in oathbreaker Price: $0.10 Foil price: $0.31