Cheapest priced copy (Mirage): $0.35 at Card Kingdom, near mint, their price list as of .
Soulshriek 
Instant · Common · Mirage · #145
Target creature you control gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard. Sacrifice that creature at the beginning of the next end step.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 145 | Common | $0.35 | — |