Cheapest priced copy (Return to Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Blistercoil Weird 
Creature — Weird · 1/1 · Uncommon · Return to Ravnica · #211
Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 211 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2012Blistercoil Weird will get +1/+1 even if the instant or sorcery spell is countered or if Blistercoil Weird is untapped when its ability resolves.
- 1 October 2012Blistercoil Weird will get +1/+1 and untap before that instant or sorcery spell resolves.
- 1 October 2012If you copy an instant or sorcery spell on the stack (using Nivix Guildmage’s second ability, for example), the copy isn’t cast. Blistercoil Weird’s ability won’t trigger.