With those cards and Wave, you could reasonably expect Echo to have about 4 to 6 subs, after rezzing it twice. 4 subs for 4, that would make this ice about the same price as Endless EULA. The added benefit would be that you absolutely need a breaker for this ice, since it would be resilient to Boomerang. This is fairly taxing to pass, but has no other effect.
At the very least, it is a 2 barrier with end the run. It could be worse.
Is this ice worth the inclusion? Yes, especially in horizontal decks, where you want inexpensive ices to protect your assets. Since this ice get more taxing as the game progress, it will complement well an asset spam strategy. And at 2 influences, it would be possible to see it splashed outside of HB.
All in all, it is a good addition to the HB toolbox. Having ways to make derez effect "add-up" is nice.
The art is well made, representing a kind of mirror image, echoing the name of the card (pun intended). The quote encapsulate the effect of the ice to perfection. Well done!
if echo not rezed , may i place power counter when i rez a piece of harmonic ice?— GLAUX1225