Cheapest priced copy (Eighth Edition): $1.29 at Card Kingdom, near mint, their price list as of .
Curiosity 
Enchantment — Aura · Uncommon · Masters 25 · #52
Enchant creature
Whenever enchanted creature deals damage to an opponent, you may draw a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
11 printings · $1.29 to $99.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eighth Edition | 72 | Uncommon | $1.29 | — |
| Eighth Edition | 72★ | Uncommon | — | $99.99 |
| Masters 25 | 52 | Uncommon | $1.49 | $3.99 |
| Exodus | 29 | Uncommon | $1.79 | — |
| Innistrad | 49 | Uncommon | $1.29 | $3.99 |
| Jumpstart | 147 | Uncommon | $1.29 | — |
| The List | 8ED-72 | Uncommon | $1.29 | — |
| The List | A25-52 | Uncommon | $1.29Out of stock | — |
| Secret Lair Drop | 403 | Rare | — | $19.99Out of stock |
| Secret Lair Drop | 2569 | Rare | — | $19.99 |
| Wilds of Eldraine: Enchanting Tales | 17 | Uncommon | $1.29 | $2.49 |
5 rulings from Wizards of the Coast
- 22 September 2011"You" refers to the controller of Curiosity, which may be different from the controller of the enchanted creature. "An opponent" refers to an opponent of Curiosity's controller.
- 22 September 2011Any damage dealt by the enchanted creature to an opponent will cause Curiosity to trigger, not just combat damage.
- 1 September 2023Curiosity doesn't trigger if the enchanted creature deals damage to a planeswalker or to a battle.
- 1 September 2023You draw one card each time the enchanted creature deals damage to an opponent, no matter how much damage it deals.
- 1 September 2023If you control Curiosity and it's enchanting an opponent's creature, you won't draw a card when that creature deals damage to you. The creature has to deal damage to one of your opponents for the ability to trigger.