Cheapest priced copy (Duel Decks: Nissa vs. Ob Nixilis): $0.69 at Card Kingdom, near mint, their price list as of .
Innocent Blood 
Sorcery · Common · World Championship Decks 2003 · #pk145
Each player sacrifices a creature of their choice.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
8 printings · $0.69 to $32.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Nissa vs. Ob Nixilis | 54 | Common | $0.69 | — |
| Explorers of Ixalan | 19 | Common | $0.79 | — |
| Eternal Masters | 94 | Common | $0.79 | $2.49 |
| Planechase | 33 | Common | $0.99 | — |
| Jumpstart | 244 | Common | $0.99 | — |
| Odyssey | 145 | Common | $1.49 | $32.99 |
| The List | EMA-94 | Common | $0.69 | — |
| World Championship Decks 2003 | pk145 | Common | $1.99 | — |
One ruling from Wizards of the Coast
- 8 June 2016You can cast Innocent Blood even if some (or all) players control no creatures. Those players are simply unaffected.