Cheapest priced copy (Mystery Booster 2): $1.99 at Card Kingdom, near mint, their price list as of .
Smokestack 
Artifact · Rare · Urza's Saga · #309
At the beginning of your upkeep, you may put a soot counter on this artifact.
At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $1.99 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mystery Booster 2 | 232 | Rare | $1.99 | $11.99 |
| The List | USG-309 | Rare | $6.49 | — |
| Secret Lair Countdown | 1998 | Rare | $4.49 | $4.49 |
| Urza's Saga | 309 | Rare | $16.99 | — |
| From the Vault: Annihilation | 11 | Mythic | — | $5.99 |
2 rulings from Wizards of the Coast
- 4 October 2004Adding a counter is optional. If you forget to add one during your upkeep, you cannot back up and add one later.
- 4 October 2004If a player does not have enough permanents, they sacrifice all the ones they have.