MTG Keyword Rules — Comprehensive Rules Glossary

Bargain is a static ability that functions while the spell with bargain is on the stack. “Bargain” means “As an additional cost to cast this spell, you may sacrifice an artifact, enchantment, or token.” Paying a spell’s bargain cost follows the rules for paying additional costs in rules 601.2b and 601.2f–h.

If a spell’s controller declares the intention to pay that spell’s bargain cost, that spell has been “bargained.” See rule 601.2b.

Objects with bargain have additional abilities that specify what happens if they were bargained. These abilities are linked to the bargain ability printed on that object: they can refer only to that specific bargain ability. See rule 607, “Linked Abilities.”

If part of a spell’s ability has its effect only if that spell was bargained and that part of the ability includes any targets, the spell’s controller chooses those targets only if that spell was bargained. Otherwise, the spell is cast as if it did not have those targets. See rule 601.2c.