Hardened Scales, Unbound Flourishing, and Doubling Season are all honorary Hydra tribal support cards because of the good work they do with the +1/+1 counters that many of our Hydras accumulate
Stick to the guidelines I outlined above and you'll do just fine
The voltage is weak, but it can cause a tingling paralysis.
Seeing as Magic has different sets and sometimes a rat has to crew a submarine to attack into an animated Mountain, the chances of this card succeeding is very high

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Lands already has access to this combo thanks to Thespian's Stage, and it's much easier to set up because they can simply Life from the Loam both pieces into (and back from) the graveyard