First MC clear this week; Geddon is the hardest boss, right?

I cleared the last three bosses of MC this week for the first time! My partner has been clearing for a few rotations of MC now. We one-shot Golemagg and one-shot Ragnaros, but took around eight attempts on Geddon. The decks are used are in the three attached pictures. Rend for Geddon, Charlga for Golemagg, and Drak for Rag.

Does anyone else find Geddon to be the hardest MC boss? For the full clear, we one shot every boss except Lucifron and Geddon, losing just one to Lucifron and the previously mentioned eight total attempts on Geddon.

I don't know, I was legitimately shocked to kill Rag in my first attempt ever. We're decently high level but not fully mazed out levels by any means.