Cheapest priced copy (Modern Horizons 3 Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Silverquill Lecturer 
Creature — Kor Wizard · 3/3 · Rare · Modern Horizons 3 Commander · #96
Creature spells you cast have demonstrate. (Whenever you cast a creature spell, you may copy it. If you do, choose an opponent to also copy it. Each copy becomes a token.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 Commander | 44 | Rare | $0.69 | $0.79 |
| Modern Horizons 3 Commander | 96 | Rare | $0.49 | — |
| The List | M3C-96 | Rare | $0.49 | — |
7 rulings from Wizards of the Coast
- 7 June 2024Resolving copies of permanent spells become tokens as they enter the battlefield. These tokens are not considered "created" when this happens.
- 7 June 2024If you cast a spell with demonstrate and both you and an opponent copy it, the opponent's copy will resolve first, then your copy will resolve, and finally the original spell will resolve.
- 7 June 2024You choose whether to make a copy as the demonstrate ability resolves. This happens before the original spell resolves. Your copy goes on the stack above the original spell.
- 7 June 2024If you cast the spell and choose not to copy it, no opponent will get to copy it either.
- 7 June 2024If you copy a spell with demonstrate, you then immediately choose an opponent. If they copy the spell, it goes on top of the stack.
- 7 June 2024If any additional or alternative costs were paid to cast the spell with demonstrate, the copies will see those choices as well. For example, if the spell has a kicker ability and was kicked, the copies will also be kicked
- 7 June 2024If the spell had an X value chosen for it as it was cast, the copies will have the same value of X.