First printed in Strixhaven: School of Mages (2021)

Professor's Warning

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.)

MTGO price: 0.002 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).

In the last 30 days 0.0% of Commander decks played it (1 of 6150). Most played in Baron Helmut Zemo.

Legality

Constructed

Standard Not legal
Pioneer Legal
Modern Legal
Legacy Legal
Vintage Legal
Pauper Legal
Future Standard Not legal
Historic Legal
Timeless Legal
Alchemy Not legal
Penny Dreadful Not legal
Premodern Not legal
Old School 93/94 Not legal

Singleton

Gladiator Legal

Commander formats

Commander Legal
Duel Commander Legal
Pauper Commander Legal
PreDH Not legal
Tiny Leaders Legal
Oathbreaker Legal
Brawl Legal
Standard Brawl Not legal
Competitive Brawl Legal

In tournament decks of the last 30 days

Commander Other periods →

In 1 of 6150 decks (0.0%).

Share of decks

0.0%

= vs previous 30 days

Weekly, last 90 days

Decks

1 main, 0 sideboard

Avg. copies

1.0

in the main deck

Win rate

0 top 8 (challenges only)

Archetypes by metagame share

Archetype	Meta	Play it
Baron Helmut Zemo	0.1%	25%

Played together with

Not enough decks yet.

Best win rate

Deck	Record
Baron Helmut Zemo Poovender Rao in Quantum Nexus' Highlander 10K	0-5 0%

Challenges only: MTGO publishes only the 5-0 league decks.

Latest decks

Deck	Copies	Finish
Baron Helmut Zemo Poovender Rao, 3 Oct	1 main	#72 0-5

No recent decks in: Pioneer, Modern, Legacy, Vintage, Pauper, Duel Commander.