Even if they interact with the robots, the robots left in their wake have all kinds of other utility
Out of the three of them, I think Jace, Wielder of Mysteries is the perfect mix of usefulness and power: he can be played early in the game for advantage, but he also encourages combat as he can be attacked directly
This alone would honestly be enough to account for the General Tazri MTG price spike
I don't want to get ahead of myself, but this card seems shockingly good
(If you're up for strolling through memory lane, you can view all the reported 2007 Regionals decklists here.) But, like many others at the time, one of the first events I remember seeing Tarmogoyf making a splash in was a Tarmogoyf made the Top 8, and one ended up winning the tournament