BP equips cards; SP pays for actions
BP limits what you can equip. SP is paid when you use an action in battle. A passive card can consume BP without having an SP action cost.
Check stacking before adding copies
Extra copies can change both effects and action SP. The stack limit in the table is not a promise that every copy is obtainable on a current save. The calculator applies each listed card’s own SP rule.
Check equipment and progression
Slinger disables Ball actions. Bodyguard needs an ally. Call: Cassie is a Chapter 5 completion reward, so it cannot be part of a first-clear setup for that chapter.