It has a bunch of keywords and lets you buff your Squirrels with other Squirrels, and it has card draw if you hit people with Squirrels
I played with Thopter Engineer a lot and am happy that a similar replacement is here
Sneaky answers include things like Kheru Spellsnatcher , who can steal a spell for its morph cost, and Trygon Predator , who can conceal its true identity as a 2/2 face-down card until it's time to spring into action to destroy an artifact or enchantment
These last two cards arent better than Faithbound Judge in isolation
In general, when looking at power level, I considered the overall game plan, the synergy of the 99 with that game plan, things like interaction, ramp, mana base and card draw, the commander, and the power of the remaining stand-alone cards