As much as I enjoyed the enchantment-based approach with the Classes, I prefer these artifacts because they offer a more versatile approach, since you can pass the jobs around
In the end most decks ended up eschewing Infiltrator for another identically costed card that was indisputably more powerful and important, since having two creatures in that slot would have been highly awkward for many draws
For a low cost of just a single ink, this ruby card allows a character who has taken damage to gain an extra three strength this turn
The Amulet deck remained top tier even after various bans Summer Bloom, Once Upon a Time, Field of the Dead and its all due to this sick six drop creature
But the Challenger +2 is not going to be super relevant much of the time, so unless you have other action synergies going on, this card isn't going to be worth a spot