Plague Bomb VS Church of Sigmar?

By dukelp, in Warhammer Invasion Rules Questions

Plague Bomb

Action: Deal 1 damage to target unit. Deal 2 damage to another target unit. Deal 3 damage to a third target unit.

Church of Sigmar

Kingdom. Opponents cannot target your units with card effects unless they pay an additional 1 resource per effect.

Plague Bomb has Multiple effects

need to pay additional 3 or 1 resource to use plague bomb to target 3 units?

why?

and what's defferent between "effect" and "card effect" ?