Cheapest priced copy (Betrayers of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Call for Blood 
Instant — Arcane · Common · Betrayers of Kamigawa · #63
As an additional cost to cast this spell, sacrifice a creature.
Target creature gets -X/-X until end of turn, where X is the sacrificed creature's power.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Betrayers of Kamigawa | 63 | Common | $0.35 | $0.49 |
| Salvat 2005 | F52 | Common | — | — |
4 rulings from Wizards of the Coast
- 1 February 2005You may sacrifice the creature chosen as the target for Call for Blood (if you control it) when you pay the additional cost for the spell. If you do, Call for Blood doesn’t resolve.
- 1 February 2005Uses last known information for the sacrificed creature’s power.
- 15 April 2013You must sacrifice exactly one creature to cast this spell; you cannot cast it without sacrificing a creature, and you cannot sacrifice additional creatures.
- 15 April 2013Players can only respond once this spell has been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to prevent you from casting this spell.