Cheapest priced copy (Murders at Karlov Manor): $1.49 at Card Kingdom, near mint, their price list as of .
Case of the Ransacked Lab 
Enchantment — Case · Rare · Murders at Karlov Manor · #45
Instant and sorcery spells you cast cost {1} less to cast.
To solve — You've cast four or more instant and sorcery spells this turn. (If unsolved, solve at the beginning of your end step.)
Solved — Whenever you cast an instant or sorcery spell, draw a card.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $1.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 45 | Rare | $1.49 | $1.99 |
| Murders at Karlov Manor Promos | 45p | Rare | $2.29 | $4.99 |
| Murders at Karlov Manor Promos | 45s | Rare | — | $2.79 |
9 rulings from Wizards of the Coast
- 2 February 2024Being solved is not part of a permanent's copiable values. A permanent that becomes a copy of a solved Case is not solved. A solved Case that somehow becomes a copy of a different Case stays solved.
- 2 February 2024"To Solve — [condition]" means "At the beginning of your end step, if [condition] and this Case is not solved, it becomes solved."
- 2 February 2024Once a Case becomes solved, it stays solved until it leaves the battlefield.
- 2 February 2024The meaning of "solved" differs based on what type of ability follows it. "Solved — [activated ability]" means "[Activated ability]. Activate only if this Case is solved." Activated abilities contain a colon. They're generally written "[Cost]: [Effect]."
- 2 February 2024"Solved — [static ability]" means "As long as this Case is solved, [static ability]." Static abilities are written as statements, such as "Creatures you control get +1/+1" or "Instant and sorcery spells you cast cost {1} less to cast."
- 2 February 2024Each Case has two special keyword abilities: to solve and solved.
- 2 February 2024"Solved — [Triggered ability]" means "[Triggered ability]. This ability triggers only if this Case is solved." Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]."
- 2 February 2024Cases don't lose their other abilities when they become solved.
- 2 February 2024"To solve" abilities will check for their condition twice: once when the ability would trigger, and once when it resolves. If the condition isn't true at the beginning of your end step, the ability won't trigger at all. If the condition isn't true when the ability resolves, the Case won't become solved.