Cheapest priced copy (Kaladesh): $0.35 at Card Kingdom, near mint, their price list as of .
Underhanded Designs 
Enchantment · Uncommon · Kaladesh · #104
Whenever an artifact you control enters, you may pay {1}. If you do, each opponent loses 1 life and you gain 1 life.
{1}{B}, Sacrifice this enchantment: Destroy target creature. Activate only if you control two or more artifacts.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 104 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 20 September 2016You can pay {1} only once each time Underhanded Designs's triggered ability resolves. You can't pay more to cause your opponents to lose more life.
- 20 September 2016In a Two-Headed Giant game, Underhanded Designs's first ability causes the opposing team to lose a total of 2 life. You still gain only 1 life.
- 20 September 2016The number of artifacts you control is checked only as you activate Underhanded Designs's last ability. It's not checked again as it resolves.