Question about +stat buffs on familiars

I have a rank 2 zombie mushroom, unless you mean rank 3. It dropped for me on the first kill while I was walking to mushroom kingdom.

Oh wait, thats annoyed zombie mushroom, oh well. Nevermind on this, but its probably a event only type of card thats all.

I was naming them according to the familiar data extraction post, so rank 2 is actually rare quality, rank 0 being common.

But yeah, I've seen a few in FM from booster packs, I assume the rest of the rare rank common mobs are event only or booster pack only. Sucks, because some of them are pretty awesome.