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Professor Onyx
LEGENDARY PLANESWALKER — LILIANA Mythic
Duskmourn: House of Horror Commander EDHREC #2,404
$5.07
-2.3%
7 days
Price history
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Professor Onyx price history chart, default range 3 months. currently $5.07.
Professor Onyx Price Summary
Professor Onyx's current headline price is $5.07.
Professor Onyx Printings & Prices
5 printings
Professor Onyx has 5 tracked printings across 3 sets, in nonfoil and foil finishes, including borderless, promo pack and prerelease treatments.
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Sell Professor Onyx: Buylist Offers
10 offers
| Buyer | Printing | Finish | Cash offer | Retail | Spread |
|---|---|---|---|---|---|
| Card Kingdom | STX #276 | Foil | — | — | — |
| CoolStuffInc | STX #276 | Foil | — | — | — |
| Card Kingdom | PSTX #83s | Foil | — | — | — |
| CoolStuffInc | STX #276 | Nonfoil | — | — | — |
| Card Kingdom | STX #276 | Nonfoil | — | — | — |
| CoolStuffInc | STX #83 | Foil | — | — | — |
| Card Kingdom | STX #83 | Foil | — | — | — |
| Card Kingdom | STX #83 | Nonfoil | — | — | — |
| CoolStuffInc | STX #83 | Nonfoil | — | — | — |
| Card Kingdom | PSTX #83p | Foil | — | — | — |
Professor Onyx Rules Text & Legality
View on Scryfall ↗Magecraft — Whenever you cast or copy an instant or sorcery spell, each opponent loses 2 life and you gain 2 life.
+1: You lose 1 life. Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
−3: Each opponent sacrifices a creature with the greatest power among creatures that player controls.
−8: Each opponent may discard a card. If they don't, they lose 3 life. Repeat this process six more times.
Professor Onyx is legal in Pioneer, Modern, Legacy and Commander, and not legal in Standard and Pauper.
standard
Not legal
pioneer
Legal
modern
Legal
legacy
Legal
commander
Legal
pauper
Not legal
Professor Onyx Rulings
5 most recent
- Apr 16, 2021 Each magecraft ability has a different effect, although they all have the same trigger condition, whenever you cast or copy an instant or sorcery spell.
- Apr 16, 2021 For example, if you control Archmage Emeritus and cast an instant or sorcery spell, Archmage Emeritus's magecraft ability will trigger and you will draw a card.
- Apr 16, 2021 If an effect creates a copy of an instant or sorcery spell, this will also cause the magecraft ability to trigger.
- Apr 16, 2021 If an effect creates multiple copies of an instant or sorcery spell, magecraft abilities trigger once for each copy created by the effect.
- Apr 16, 2021 Some effects instruct you to copy an instant or sorcery card in a zone other than the stack. These copies do not cause magecraft abilities to trigger. However, most effects that do this also allow you to cast the copy, and casting the copy will cause magecraft abilities to trigger.
Reprints & Reprint Risk
8 printings
Professor Onyx has been reprinted 8 times. The Duskmourn: House of Horror Commander reprint cut the price 67% in 30 days.
| Set | Date | Rarity | Treatment | Price before | Day 1 | 30 days | 90 days |
|---|---|---|---|---|---|---|---|
| DSC #153 | 2024-09-27 | Mythic | Standard | — | — | — | — |
| PSTX #83s | 2021-04-23 | Mythic | Prerelease | — | — | — | — |
| STX #276 | 2021-04-23 | Mythic | Borderless | — | — | — | — |
| STX #276 | 2021-04-23 | Mythic | Borderless | — | — | — | — |
| PSTX #83p | 2021-04-23 | Mythic | Promo Pack | — | — | — | — |
| PSTX #83p | 2021-04-23 | Mythic | Promo Pack | — | — | — | — |
| STX #83 | 2021-04-23 | Mythic | Standard | — | — | — | — |
| STX #83 | 2021-04-23 | Mythic | Standard | — | — | — | — |
PSTX #83s 
STX #276 Professor Onyx in Commander
Professor Onyx is the #2,404 most-played card on EDHREC, down 28 places over the last 30 days.
Professor Onyx FAQ
How much is Professor Onyx worth?
Professor Onyx is worth about $5.07 for its cheapest playable printing as of Sep 24, 2026.
Is Professor Onyx legal in Commander?
Yes — Professor Onyx is legal in Commander. It is also legal in Pioneer, Modern and Legacy.
Has Professor Onyx been reprinted?
Yes — Professor Onyx has been reprinted 8 times, with 5 printings tracked on The Index.
Why is Professor Onyx expensive?
Professor Onyx holds a $5.07 price because even with 8 reprints, demand keeps pace with supply.