Cheapest priced copy (Amonkhet): $0.35 at Card Kingdom, near mint, their price list as of .
Trial of Knowledge 
Enchantment · Uncommon · Amonkhet · #73
When this enchantment enters, draw three cards, then discard a card.
When a Cartouche you control enters, return this enchantment to its owner's hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Amonkhet | 73 | Uncommon | $0.35 | $0.49 |
| Foundations Jumpstart | 379 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 18 April 2017Each Trial has an ability to return to your hand when a Cartouche enters the battlefield under your control. The Trial is returned to its owner's hand only if it's on the battlefield as the ability resolves.