Cheapest priced copy (Secrets of Strixhaven): $1.49 at Card Kingdom, near mint, their price list as of .
Silverquill, the Disputant 
Legendary Creature — Elder Dragon · 4/4 · Mythic · Secrets of Strixhaven Promos · #226p
Flying, vigilance
Each instant and sorcery spell you cast has casualty 1. (As you cast that spell, you may sacrifice a creature with power 1 or greater. When you do, copy the spell and you may choose new targets for the copy.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $1.49 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secrets of Strixhaven Promos | 226p | Mythic | $1.99 | $7.99 |
| Secrets of Strixhaven | 226 | Mythic | $1.49 | $1.49 |
| Secrets of Strixhaven | 287 | Mythic | $4.49 | $10.99 |
4 rulings from Wizards of the Coast
- 20 March 2026Casualty N means "As an additional cost to cast this spell, you may sacrifice a creature with power N or greater." and "When you cast this spell, if a casualty cost was paid for it, copy it. If the spell has any targets, you may choose new targets for the copy."
- 20 March 2026The copy of the spell is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger.
- 20 March 2026If you pay the casualty cost of a spell, the copy will resolve before the original spell.
- 20 March 2026You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.