Tbh I don't know if this will make the metagame less annoying. It's just an idea I had ^^
However I'm not sure you get my post, I'm not saying that only graboids rush are annoying but that all the dcks are annoying, due to containing 6 exemplar of a cards, all decks are very limited, usually have a single aim, and get hard countered easily (I mean almost every deck have an easy hard counter, see the FG for example, even with a big boost they are very easy to EM when you know they'll come, except rainbow who use a large array of cards : PC, CC, heal, rush, draw etc..)
I agree with Male that we need fresh new cards. I tried myself to make some with an inexistant success.
What I dislike in the game is the hard counter because it make the game totally annoying.. And what's happening is that when an OP cards come out, instead of nerfing it, they give it an hard counter. (see sosac and purify, see SoFo and CC etc..)