It's enjoyable, but it'd be even more so if there were just a few more competitive cards - or fewer cards that have nothing to do with Inventors
The mana you waste trying to get maximum value from your Nihil Spellbomb may be better used developing your own game plan so you can take away their time to recover
Over half of the cards are Inventors or Robots, or give buffs or cost reductions to those two
Im not sure if this is better than URs excellent signpost uncommons though, as the floor is definitely lower than something like Shantotto, Tactician Magician
Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .) Other artifacts you control have ward
By including a swath of card types in your deck, and having ways to smartly fill your graveyard, you can gain some pretty powerful benefits on your creatures and spells by hitting the four or more different card type requirement.