Cheapest priced copy (The List): $2.49 at Card Kingdom, near mint, their price list as of .
Mister Sinister, Hubris Unbound 
Endrek Sahr, Master Breeder
Legendary Creature — Human Wizard · 2/2 · Rare · Secret Lair Drop · #2620
Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value.
When you control seven or more Thrulls, sacrifice Endrek Sahr.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
8 printings · $2.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2013 | 76 | Rare | $2.99 | — |
| Commander Masters | 155 | Rare | $2.99 | $4.49 |
| Commander Masters | 511 | Rare | — | — |
| Modern Masters 2015 | 82 | Rare | $3.49 | $4.49 |
| The List | CMM-155 | Rare | — | — |
| The List | TSP-106 | Rare | $2.49 | — |
| Secret Lair Drop (Mister Sinister, Hubris Unbound) | 2620 | Rare | $2.99 | $3.49 |
| Time Spiral | 106 | Rare | $2.99 | $16.99 |
3 rulings from Wizards of the Coast
- 25 September 2006When the second ability resolves, Endrek Sahr will be sacrificed regardless of how many Thrulls you control at that time, even if it's less than seven.
- 25 September 2006The second ability is a state trigger. Once it triggers, it won't trigger again as long as the ability is on the stack. If the ability is countered and the trigger condition is still true, it will immediately trigger again.
- 25 September 2006Face-down spells are creature spells, but they have mana value 0.