Arakni, Tarantula is a P Chaos Assassin Demi-Hero card from Flesh and Blood (Local Game Store Promos, LGS).
P
Local Game Store Promos (LGS)
Card Text
Whenever a dagger you own hits a hero, they lose 1{h}.
Once per Turn Attack Reaction - Discard an Assassin card: Target dagger attack gets +3{p}.
At the beginning of your end phase, return to the brood.