Professor's Warning
STXStrixhaven: School of Mages/#84/2021Common
Colour IDMV 1
Current paper retail
Card Kingdom$0.35
Cardmarket€0.06
ManaPool$0.15
TCGplayer$0.35
Buylist (dealers pay)
Card Kingdom$0.01
MTGO (Cardhoarder)
retail$0.03 tix
Paper retail history (USD)
3 providers
Latest $0.35High $0.39Low $0.35▲ 0.0%
Market and collecting
Market overview
$0.35TCGplayer, USD, retail, nonfoil
Latest observation: 2026-11-10
7d▲ 9.4%30d▲ 16.7%90d▲ 29.6%
90d high
$0.37
90d low
$0.24
Paper printings priced
1
Currently 1st
Cheapest paper printing
$0.28
Strixhaven: School of Mages
- Up 16.7% over the last 30 days on TCGplayer.
- Currently 5% below its 90 day high of $0.37.
- Foil copies of this printing are trading 20% below nonfoil.
Find this printing on eBayView on TCGplayerAffiliate. MTGPrices may earn from qualifying eBay and TCGplayer purchases.
Collect
Play
Compare printings (1 priced)
Gameplay and rules
Instant
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.)
Card capabilities
Instant
Derived deterministically from card types, Oracle text and keywords. Not a strategic evaluation.
Format legality
Primary formats
Eternal formats
Rulings
No rulings recorded for this card.
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Ranked by shared capabilities, colour identity, mana value and type. Never by strategic judgement.
About this card
Professor's Warning
Professor's Warning is an Instant, with mana cost {B} (mana value 1).
Format legality: Commander: legal, Modern: legal, Standard: not_legal, Pioneer: legal, Legacy: legal, Pauper: legal.
Current headline price on TCGplayer: $0.35 (up 16.7% over 30 days).
Frequently asked
Professor's Warning FAQ
How much is Professor's Warning worth?
The current TCGplayer USD retail price for Professor's Warning is $0.35. It is up 16.7% over the last 30 days. Over 90 days it has ranged from $0.24 to $0.37.
What is the cheapest printing of Professor's Warning?
The cheapest currently priced paper printing is from Strixhaven: School of Mages at $0.28 on TCGplayer.
What set was Professor's Warning first printed in?
The earliest English paper printing that MTGPrices tracks is from STX #84, released 2021-04-23.
Is there a foil version of Professor's Warning?
Yes. On this printing, foil copies trade at $0.28 versus $0.35 for nonfoil, which is 20% less expensive on TCGplayer.
Is Professor's Warning legal in Commander?
Yes, Professor's Warning is currently legal in Commander per Scryfall's legality feed.
Is Professor's Warning legal in Modern?
Yes, Professor's Warning is currently legal in Modern per Scryfall's legality feed.
Is Professor's Warning legal in Standard?
Professor's Warning is not currently legal in Standard per Scryfall's legality feed.
What does Professor's Warning do?
Professor's Warning is an Instant with mana cost {B}. Its Oracle text reads: "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.)".