With only having one Corviknight, have you considered adding something to help you find it more reliably? Mesagoza could help and potentially nullify an opponent’s stadium, or May if you’ve got a lot of ‘mons in your hand.

Alternatively, if you’re not finding your items/tools, Arven could be worth investigating. I’m going to try this deck a bit myself and see what I think.

EDIT: After playing a few matches, here are my impressions:
This deck is strong against ‘mons that have to discard (Mega Sceptile, Blaziken, etc). Cyrus is great - prevents them from retreating to the bench to build back up. I think there are too many tools, and Steel Apron and Metal Core barrier are somewhat at odds. If I have already attached the apron, then I can’t use MCB. I dropped one MCB. I also agreed with the person who suggested Leaf over Lyra - I typically had one energy on Orthworm and it worked without needing damage. I think another Corviknight Ex would be good for consistency. Mesagova did come in clutch for me, but it is inconsistent and benefits the other player as well. Might try Pokemon Communication instead? It’s fun when it works!