Talk:Sacred Seika/@comment-180.214.232.3-20170422105808/@comment-16682378-20170422160727

Passive skills are additive: Building bonuses, Unit Bonuses, passive secondary skills (e.g. Celestial Oracle), the likability of the card.

Active buffs stack multiplicative. In your case the cards get:

1.5^2 x 1.3^3 = 4.95 buff x [total passive buff]

Multiply this with x5 for Seika/Red Sally Salvo.