CR / RELEASE 2026-07-24
Rule 356.2.a
Mandatory Additional Costs
Rule hierarchy
Direct children
356.2.a.1Some Additional Costs specified by Passive Abilities on the card being played or another card are Mandatory, and must be paid to complete playing the card. They use the phrase "as an additional cost" and don't include the word "may." Example: A unit has the passive ability "As an additional cost to play me, kill a friendly unit." To play that unit, a player must kill a friendly unit. See rule 363. Passive Abilities for more information.356.2.a.2The cost imposed by the Deflect keyword is a Mandatory Additional Cost. See rule 809. Deflect for more information.