Cheapest priced copy (Secret Lair Drop): $4.49 at Card Kingdom, foil, near mint, their price list as of .
Prince of Thralls 
Creature — Demon · 7/7 · Mythic · Shards of Alara · #182
Whenever a permanent an opponent controls is put into a graveyard, put that card onto the battlefield under your control unless that opponent pays 3 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $4.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shards of Alara | 182 | Mythic | $5.49 | $16.99 |
| Secret Lair Drop | 1549 | Mythic | $5.49 | — |
| Secret Lair Drop | 1549★ | Mythic | — | $4.49 |
3 rulings from Wizards of the Coast
- 1 October 2008If the permanent that caused the ability to trigger leaves the graveyard before the ability resolves (because it’s a token and it ceased to exist, or because a spell or ability removed it from the graveyard), the ability will still resolve. The opponent will have the option to pay 3 life. But whether or not that player pays the life, nothing will be returned to the battlefield.
- 1 October 2008If the ability triggers and your opponent chooses not to pay 3 life, you must return the card to the battlefield, even if you don’t want to.
- 1 October 2008It doesn’t matter whose graveyard the permanent is put into as long as an opponent controlled it when it last existed on the battlefield.