Create a {joker} when this joker is destroyed (not by selling).
(cannot appear with an eternal sticker)
Target is most likely to be selected randomly and displayed immediately in flavor text, target rarity is most likely to be this+1, i.e. uncommon → rare.
Rare → legendary is also possible but a bit questionable, in that case it's probably better to hide the joker name and just say "legendary joker". Probably not happening as a way to keep the Soul the only entry point.
Means to activate off the top of my head:
- Madness
- Dagger
- Hex
- Ankh
, the whole point of legendaries is that you can only get them extremely rarely from packs