Cheapest priced copy (Duel Decks: Izzet vs. Golgari): $0.35 at Card Kingdom, near mint, their price list as of .
Thunderheads 
Instant · Uncommon · Guildpact · #37
Replicate {2}{U} (When you cast this spell, copy it for each time you paid its replicate cost.)
Create a 3/3 blue Weird creature token with defender and flying. Exile it at the beginning of the next end step.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Izzet vs. Golgari | 23 | Uncommon | $0.35 | — |
| GRN Guild Kit | 27 | Uncommon | $0.35 | — |
| Guildpact | 37 | Uncommon | $0.35 | $0.49 |
| Guildpact | 37★ | Uncommon | — | — |