Cheapest priced copy (Rise of the Eldrazi): $0.79 at Card Kingdom, near mint, their price list as of .
Sphinx-Bone Wand 
Artifact · Rare · Duel Decks: Izzet vs. Golgari · #29
Whenever you cast an instant or sorcery spell, you may put a charge counter on this artifact. If you do, this artifact deals damage equal to the number of charge counters on it to any target.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.79 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Izzet vs. Golgari | 29 | Rare | $0.99 | — |
| Rise of the Eldrazi | 225 | Rare | $0.79 | $5.99 |
3 rulings from Wizards of the Coast
- 15 June 2010If you cast an instant or sorcery spell, Sphinx-Bone Wand’s ability triggers and goes on the stack on top of it. The ability will resolve before the spell does.
- 15 June 2010If Sphinx-Bone Wand leaves the battlefield before its ability resolves, you won’t be able to put a charge counter on it. As a result, it won’t deal damage.
- 15 June 2010If the targeted permanent or player is an illegal target by the time the ability resolves, the ability doesn’t resolve. You won’t put a charge counter on Sphinx-Bone Wand and it won’t deal damage.