Cheapest priced copy (Time Spiral): $0.35 at Card Kingdom, near mint, their price list as of .
Skittering Monstrosity 
Creature — Horror · 5/5 · Uncommon · Time Spiral Remastered · #137
When you cast a creature spell, sacrifice this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 129 | Uncommon | $0.35 | $0.49 |
| Time Spiral Remastered | 137 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 March 2021An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.