In the new tighter version of the Birthing Chamber cycle.

Playtesting proved this is problematic. Particularly on anything that can effectively tap for Torque. It's a pity, because this cycle would like to be five different types of artifact, but there's very little that you can do as a poly-activated ability on a connector. This may have to turn into a non-connector artifact with a "[Torque] or NU: Something, Add [Steam]" ability.

I'm currently leaning towards reconcepting Gyrocopter Puffer as something that can take [Torque] and turn it into [Steam]. Wants to do something different to Rodent-Run Automaton's +2/+0, though.

It would be nice if I could keep this as a connector. One other idea beyond "untap connected artifact" as an effect it makes sense to poly-activate is "put a charge counter on connected artifact". I have barely any artifacts that use charge counters as the moment, though, so this would either be pointless in this set, or need me to change several other cards. (Scars of Mirrodin had 14 charge-counter artifacts, including 4 commons, and 6 uncommons including a 5-card cycle. Mirrodin Besieged had 3. Original Mirrodin only had 4 uncommons and 4 rares, even though it had Power Conduit; Darksteel had 8 and Coretapper; Fifth Dawn had 8 and Energy Chamber.)

It would also still be possible to tweak the power signet cycle to take pain on producing power rather than washing power into mana: I agree the other way emphasises the power-production better, and that it might not solve the problem long-term, but it might be just enough to prevent the infinite combo.