I'm not sure how they gave the ok to MC as it is now. Sure, you want to make Paladin's secret to see play, that's a good thing to aim for, to make old cards playable, there is really no other way to make them playable than to put all of them into play at once either, that's fine. But this is a 6 drop 6/6, that's ridiculous. Normally when you have a 6 drop that does something significant, it's no longer a 6/6. See Sylvanas or Emperor and those are legendary. We have highmane as a 6 drop class card, which is a 6/5 with a strong deathrattle, Coldarra Drake, is a 6 6/6 but the effect actually cost mana to use and it's not an instant value effect, so it makes sense it's a 6/6. MC has no stat drawback, that's ridiculous, even if your secrets end up not doing much, this thing trades so well. It should definitely be a 5/5. The effect is definitely as strong as Emperor that saves you mana or Sylvanas that can maybe steal something, this one draws up to 5 cards and play them for up to 5 mana value, yeah....
I still don't think the deck is very good but it is annoying when it has now become the new cancer.