Originally Posted by xero

Yeah I guess I haven't entirely digested the helper and its impact on all of this. There's also the subject of lineups being less than optimal for defense vulnerable due to having their deck set up for attacking.

Exactly.

Also, take into account that cards don't line up by highest SED, but by deck order.
That means that, if you play agressively (login at least once an hour, load an attack deck, attack fast for 10 or less minutes, reload a defensive deck, rinse, repeat) you could easily leave your weakest card center, just to make sure you neutralize their best card (which will almost always be center) if you get the right helper; or just lose your worst one if you don't.

Just like that, you have tactics involved in the order you build your deck, the attributes you put in your deck, deck rotations, etc.
This is the kind of thing you can play with friends and enjoy; that can be also played in a semi-competitive teeth-grinding level