You want Memes? I show you a meme: Dark Roaches, taking inspiration from a time before markets! (go and look it up, be sure to filter for "updated since the beginning")
Clockroach is fun.
Crown of Possibilities is also fun. Those two cards always loved to be played together.
We have the usual Echo-support cards in
Second Sight and
Nesting Avisaur. They allow us to put a card with echo back on top of the deck and basically draw another copy of it.
Twinning Ritual is even better in giving us two copies of an Echo-care, both being buffed! And with shadow, we can also play
Dark Return, which allows us to draw and double an echo-unit from our void.
Shadow in general is for Dark Return and Removal. Is it worth it to go 3f for this? I believe so.
Tock Tick is a Clockroach and benefits from playing the normal Clockroaches. Having revenge means you'll draw it twice, having twice the chance of giving it relevant battleskills
Twinbrood Sauropod is kind of the bread-and-butter Echo-Unit. Kinda solid stats, not too high requirements, and nice if it gets some really good battleskills.
Thunderstrike Dragon is the top-end Echo-Unit. 5/6 for 6PPP is quite good, especially if you can give it some relevant Battleskills or just pump it up.
The Market:
Why
Wasteland Broker in throne? You may draw the cards later and can't use market-echo-shenanigans! But most cards are better when you draw multiples of them, and you sometimes just really want to play all four Swirl the Sands.
Swirl the Sands is Relic Removal, Curse Removal and Unit removal. If you expect your opponent to play either Relics, Curses or lots of Flying units, this is your go-to. It removes more efficient as other cards, as it puts on bottom of the deck, thus disabling Reanimating the target.
Immortalize with Echo? Yes please! More and possibly better DR.
In Cold Blood is a slow removal with potential upside.
Xenan Obelisk is good because you (hopefully) pump out a lot of units thanks to Echo.
Severin of the Dark is more of a flex spot right now. I imagine it to be quite good to pump out some
Piercing Griefs and then drawing them with new battleskills, but I never really got him out if the market.
So, let me hear ya thoughts, guys!