Cheapest priced copy (Oath of the Gatewatch): $0.49 at Card Kingdom, near mint, their price list as of .
Remorseless Punishment 
Sorcery · Rare · Oath of the Gatewatch · #89
Target opponent loses 5 life unless that player discards two cards or sacrifices a creature or planeswalker of their choice. Repeat this process once.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 89 | Rare | $0.49 | $0.49 |
| The List | OGW-89 | Rare | $0.49 | — |
| Oath of the Gatewatch Promos | 89s | Rare | — | $0.99 |
4 rulings from Wizards of the Coast
- 22 January 2016No player may take any actions between the two times the player goes through the process.
- 22 January 2016Any abilities that trigger while Remorseless Punishment is resolving will be put on the stack after it has completely resolved.
- 22 January 2016The player can’t choose to discard two cards unless they have at least two cards in hand. Similarly, that player can’t choose to sacrifice a creature or planeswalker unless they control one. This means that if the target opponent doesn’t have two cards in hand and doesn’t control a creature or planeswalker, that player will lose 5 life and then lose 5 life again.
- 8 April 2016The same player chooses both times. In a multiplayer game, you can’t choose a different opponent to repeat the process.