Outside of the two Aetherdrift Commanders, Hildibrand would also work in a Varina, Lich Queen deck
It starts as a mana source, then it makes a massive Construct token that gets stronger with every artifact you control
There are 1,815 cards possible in a pack, so your experience is going to go wild
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
Chain Assassination + Distract the Guards + Eagle Vision + Petty Larceny + Restart Sequence Each of these cards, if you can get them down for the 2-mana freerunning cost, is way above rate