Does Friendship give +1 Might per unit with the listed tags, or +1 Might per unique tag present among your units?

Ruling: Friendship gives +1 Might for each unique tag (Bird, Cat, Dog, or Poro) present among your units, not for each individual unit with those tags. The maximum bonus is +4 Might if you control at least one unit with each of the four listed tags.

Nuances:

• If you have 3 Birds, 2 Poros, and 1 Cat in play, Friendship gives +3 Might (three unique tags present), not +6.
• Multiple units sharing the same tag do not increase the bonus beyond +1 for that tag.