Barter in Blood

Sorcery

Each player sacrifices two creatures.

2012-05-01:
The active player chooses which creatures will be sacrificed first, then each other player in turn order does the same. Then all creatures are sacrificed simultaneously.
2012-05-01:
If a player controls only one creature, that creature is sacrificed.
2012-05-01:
Barter in Blood doesn’t target any creatures and may be cast even if a player controls fewer than two creatures.