Cheapest priced copy (Kaladesh): $0.35 at Card Kingdom, near mint, their price list as of .
Morbid Curiosity 
Sorcery · Uncommon · Kaladesh · #94
As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw cards equal to the mana value of the sacrificed permanent.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 149 | Uncommon | $0.49 | $1.49 |
| Kaladesh | 94 | Uncommon | $0.35 | $1.49 |
3 rulings from Wizards of the Coast
- 20 September 2016If a permanent has {X} in its mana cost, X is considered to be 0.
- 20 September 2016To determine how many cards to draw, use the mana value of the permanent immediately before you sacrificed it.
- 20 September 2016If an effect copies Morbid Curiosity, the controller of the copy will draw the same number of cards as determined by the original. Its controller can't and doesn't have to sacrifice a permanent.