You always have creative ideas. I'm glad to see another.
Thoughts:
ThemeConstruct (used as Golem/Robot), while better than Golem or Robot does not sound as elementally generic as Dragons,
Nymphs or Shards. This is not to imply that it is not generic enough. It is merely an area that is easily changed provided someone knows a better term.
Construct has an alternate meaning of "something constructed by the mind (a theoretical entity)". This meaning could include artificially crafted spirits or personifications of ideas.
MechanicConstruct (the passive ability) represents the unreliability of these constructs. Having it be one ability is concise and simple but comes with the drawback of balancing the randomness so it fits both unpredictable and predictable elements.
All of the possible side effects are well thought out and would be valuable additions to the game code making many other ideas easier to implement.
The damaging malfunction possibility would probably be adjusted if the original hp was adjusted.
Mechanical Theme (aka how the mechanics fit together)
The basic structure of these constructs is
resilient malfunctioning creatures with an intriguing ability worth repeated use. Resilient enables multiple usages of the ability however too resilient would force the ability to weaker since reuse would be assured. Malfunctioning is a drawback that reduces the synergy between resilience and the ability permitting higher resilience and a more interesting ability while still balanced.
CostBased on the mechanical theme what range of casting cost would best fit this series? The lower the cost the more fragile the creature, less interesting the ability or more devastating the malfunctioning. Likewise as the cost is increased the resilience and ability value can increase and the malfunctioning decrease. It should be fairly obvious to most that Constructs and Nymphs are mechanically similar in that they are both meant as vehicles for reusable interesting abilities. I suggest that it would be more beneficial to the game if the casting costs of the two groups were notably different. This would result in a more diverse group of cards usually resulting in a more diverse set of viable decks. From these two details I feel it is obvious that a mid-high [5-7] casting cost would fit this series better to differentiate it from the high [8-9] casting cost nymphs.
I will comment on Gamma Ray later.