Cheapest priced copy (Pro Tour Collector Set): $39.99 at Card Kingdom, near mint, their price list as of .
Necropotence 
Enchantment · Rare · Fifth Edition · #182
Skip your draw step.
Whenever you discard a card, exile that card from your graveyard.
Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.
Legal inCommander
Restricted inVintage
Banned inLegacy
Not legal inBrawlStandardPioneerModernPauper
12 printings · $39.99 to $649.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Edition | 182 | Rare | $47.99 | — |
| Deckmasters | 7 | Rare | — | $149.99 |
| Eternal Masters | 98 | Mythic | $42.99 | $74.99 |
| Ice Age | 154 | Rare | $49.99 | — |
| Iconic Masters | 98 | Mythic | $44.99 | $79.99 |
| Oversized League Prizes | 21 | Rare | — | — |
| Pro Tour Collector Set | ll154 | Rare | $39.99 | — |
| Secret Lair Countdown | 1995 | Mythic | $54.99 | $99.99 |
| From the Vault: Exiled | 9 | Mythic | — | $59.99 |
| Wilds of Eldraine: Enchanting Tales | 31 | Mythic | $39.99 | $69.99 |
| Wilds of Eldraine: Enchanting Tales | 74 | Mythic | $54.99 | $159.99 |
| Wilds of Eldraine: Enchanting Tales | 94 | Mythic | — | $649.99 |
4 rulings from Wizards of the Coast
- 17 November 2017Necropotence's last ability creates a delayed triggered ability that will put the exiled card into your hand. That ability still triggers even if Necropotence is removed from the battlefield before your end step.
- 17 November 2017If a discarded card isn't put into your graveyard (due to an effect such as that of Obstinate Baloth) or leaves your graveyard (perhaps because another effect returned it to your hand), it won't be exiled.
- 17 November 2017If you discard a card with madness and wish to cast it, Necropotence's ability won't exile that card. If you don't wish to cast it, you choose whether it ends up exiled or in your graveyard.
- 1 September 2023You can't look at the cards exiled by the last ability while they're face down.