Cheapest priced copy (Innistrad Remastered): $0.79 at Card Kingdom, near mint, their price list as of .
Killing Wave 
Sorcery · Rare · Avacyn Restored · #111
For each creature, its controller sacrifices it unless they pay X life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
5 printings · $0.79 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 111 | Rare | $1.79 | $3.99 |
| Innistrad Remastered | 121 | Uncommon | $1.29 | $0.79 |
| Innistrad Remastered | 386 | Uncommon | $0.79 | $1.99 |
| Avacyn Restored Promos | 111 | Rare | — | $14.99 |
| The List | INR-121 | Uncommon | — | — |
4 rulings from Wizards of the Coast
- 1 May 2012You can’t pay more life than you have.
- 1 May 2012A player may choose to pay life for some creatures and sacrifice the rest. It’s not an all-or-nothing decision.
- 1 May 2012If you can’t sacrifice a creature (perhaps because of Sigarda, Host of Herons), you can choose not to pay life and nothing will happen.
- 1 May 2012First, the active player chooses whether to pay X life for each creature they control. Then each other player in turn order chooses for their creatures. Then each player pays life and sacrifices creatures at the same time. Players will know the decisions of players who chose before them.