There were basically no relevant targets for any detain ability, and the best ones were often overcosted for their effects
There is a good chance this is actually an auto include just because it is a Raging Goblin that fulfils the no colour casting cost and artifact types criteria
Familiar and Junker are more reactive, offering hand attack and removal, respectively
Jokes aside, this card is actually pretty strong, giving you added benefit for adding cards to your inkwell
I could also see it as being an easy gateway into, or back into, the card game, since the way Arena can communicate information at a glance makes it easy to learn about all the new mechanics that have been introduced in the last few expansions
The reward isnt exactly game-breaking, but its certainly relevant, especially because its effectively stapled to a solid removal spell