Treasure Chest is a three-mana artifact that doesnt do anything until a stat check is made by paying four more mana and rolling a d20
The Final Fantasy Cats Final Fantasy brought us several new humanoid cats, and many of them are quite good
(The expected value of your low roll is the dice size minus the high roll EV plus 1, so 1.875 in the case of two d4s.) For the d8s used on Arcane Endeavor, the expected value of your high roll is 5.8125, which means that if you prioritize drawing cards, youll be drawing about six cards on average, and getting to cast a spell of about mana value 3
Additionally, when you deal combat damage to a player with one or more faeries you also get to goad one of their Creatures, forcing it to attack another player on their next combat step
Lorehold, the Historian does that as a 5/5 with haste, that gives you frequent rummages
They cost about $3 and includes four cards, so it doesnt seem like it would take too much to make a profit