The "parasitic" nature of the mechanic is also raising eyebrows, but we do hope that this has the potential to appear in new sets immediately in the near future
These are the height of flexibility
Surprise Party, Pietra, Crafter of Clowns, and Ticking Mime Bomb are straightforward and better if you play more robots
Some cards give you energy counters, usually on resolution, but some cards add energy during other phases as a static ability, attack triggers, damage triggers, and activated abilities
As Casualty is the tribal mechanic for the Maestros in Streets of New Capenna, it's limited to their three colours of blue, black, and red
This provides a lot of filtration in the early game and can bin cards to power delve or similar mechanics