One per deck

This page contains all the obtainable cards that have "one per deck" flag set, meaning Goobert can't copy these cards, The Mycologists can't offer a copy of these cards if player visits them with no duplicates, and these cards may not appear in card choice nodes again once player has added one to their deck.

Note that despite having this flag, it is still technically possible to obtain multiple copies of some of these cards, such as 2 Ring Worms in Mantis God starter deck or The Woodcarver giving multiple Amalgams, since events other than ones listed there are not affected by this flag.