Cheapest priced copy (The Brothers' War Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Sharding Sphinx 
Artifact Creature — Sphinx · 4/4 · Rare · Commander 2018 · #101
Flying
Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
8 printings · $0.79 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shards of Alara | 55 | Rare | $1.29 | $9.99 |
| The Brothers' War Commander | 94 | Rare | $0.79 | — |
| Commander 2013 | 56 | Rare | $0.99 | — |
| Commander 2018 | 101 | Rare | $0.79 | — |
| Jumpstart | 176 | Rare | $0.99 | — |
| March of the Machine Commander | 235 | Rare | $0.79 | — |
| Salvat 2011 | 51 | Rare | — | — |
| Starter Commander Decks | 59 | Rare | $0.99 | — |
2 rulings from Wizards of the Coast
- 1 October 2008The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.
- 1 October 2008If combat damage is dealt to players by multiple artifact creatures you control (including, perhaps, Sharding Sphinx itself), Sharding Sphinx's ability will trigger that many times. You'll get that many Thopter tokens. You'll get just one token per creature, no matter how much combat damage that creature dealt.