Cheapest priced copy (Fate Reforged): $0.35 at Card Kingdom, near mint, their price list as of .
Diplomacy of the Wastes 
Sorcery · Uncommon · Fate Reforged · #67
Target opponent reveals their hand. You choose a nonland card from it. That player discards that card. If you control a Warrior, that player loses 2 life.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fate Reforged | 67 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 24 November 2014If you control a Warrior as Diplomacy of the Wastes resolves, the target opponent will lose 2 life even if that player didn’t discard a card (perhaps because they had no cards in hand).