IMO whenever facing off mechs in battlegrounds you almost always get obliterated whilst they have almost nothing ‘top-tier’ or meme for the win…
The 3 star deflecto-bot card getting a shield on every single mech being summoned is way too strong. With almost every mech getting (or being able to easily get) a divine shield you effectively have to kill 14-20 minions (if you include the amount of times deflecto-bot re-shields) with your 7-14 max minions (if you have some who can reborn).
If mechs didn’t also have the ability to level up their attack+ health massively then it would be a bit balanced but they can get just as high (both) stats so it’s not balanced in that regard. Undead for example can reborn with high attack but they sacrifice health for almost all minions.
Logically there isn’t any way to counter mechs consistently besides playing mechs- poison just hits a shield and is wasted and even leroy can’t take out multiple mechs with taunt and given the shield bot is what provides divine shield - all mechs which get divine shield magnetized also get taunt - countering leroy.
I know on some occasions you can get super lucky and get insane stats and beat mechs, but on the whole even a so-so play with mechs can beat almost every loadout!