Cheapest priced copy (The List): $0.49 at Card Kingdom, near mint, their price list as of .
Brink of Madness 
Enchantment · Rare · Urza's Legacy · #50
At the beginning of your upkeep, if you have no cards in hand, sacrifice this enchantment and target opponent discards their hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | ULG-50 | Rare | $0.49 | — |
| Urza's Legacy | 50 | Rare | $0.49 | $6.99 |
2 rulings from Wizards of the Coast
- 15 June 2010The ability only triggers if you have no cards in your hand as your upkeep step begins.
- 15 June 2010You must sacrifice Brink of Madness if possible, but the opponent discards their hand even if you can’t sacrifice it for some reason (for example, if it were returned to its owner’s hand before the ability resolved).