Cheapest priced copy (Beatdown Box Set): $0.35 at Card Kingdom, near mint, their price list as of .
Skittering Horror 
Creature — Phyrexian Horror · 4/3 · Common · Urza's Destiny · #70
When you cast a creature spell, sacrifice this creature.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Beatdown Box Set | 30 | Common | $0.35 | — |
| Urza's Destiny | 70 | Common | $0.35 | $1.49 |
One ruling from Wizards of the Coast
- 4 October 2004Triggers when you announce a creature spell, and will resolve before that creature is put onto the battlefield.