Summary:
Casting Cost: 6 |4 + 2 cards
Activation Cost: 2 + 1
Effect: See all invisible and 1 Instant kill per turn.
Your summary is correct but you don't give any opinion ... Bad, Good?
You can already produce said 2 cards instant kill with shock wave. So I think it is considered as an acceptable mechanic. What this "machine" will bring is to give the possibility to do it repetitively. This said, without squid or permafrost the card is rendered almost useless. That's why I added this soft echolocation effect.
Perhaps you could call it, Sonar Pylon and find a steam punk looking image or even a highly sci-fi looking image, so then it makes it look more magical-steam-punkish like steam machine.
I would have done art for you, but I don't have the available resources right now.
It's kind of specialized art I am looking for. I looked around but it's difficult to find something fitting and free of use. Zanz will probably find a way to make it look good if it ever goes to the game. For now, I'll rely on any gracious artist willing to spend the time to do it or I let it run under this form.
I could however change the name for it to sound more steam-punkish ... It still have to keep a relation to sound and to water .... Not easy. Some ideas: Ice Shocker, Echo gountlet, Waves Scan, ... I'm waiting for your propositions.