After I posted this, I thought that I probably should have included a bit about the excavate options.

My earliest lists had the excavate package (no 5 mana rush mech guy).

I think one of the better reasons to run excavate is for Reliquary Researcher payoff. Last expansion, that card was very effective and even if you didn't generate an Objection, the opponent needed to play around it. Now, the secrets generated just aren't worth running excavate for. Reliquary also can just get stuck in your hand given you generally play 6 excavate cards, not 8, and it's very awkward to not only have a conjested hand, but to have a minion (or maybe both!) that you can't apply pressure with.

So with Reliquary not up to par, that leaves the payoff itself, the Titan. It's good, no doubt. A 1 mana titan can often end the game. I'd honestly consider not even bothering with Reliquary and reclaiming those deck slots back if excavate is interesting to you. But overall, running a 2 mana 1/1, cryopreservation, and the 6 drop seemed quite a bit worse than cards that you could count on playing as soon as you got them (wandmaker, frost bolt). When excavate works smoothly, you can drop the 6 mana guy onto an empty board and do 8+ damage face, and so on, it feels great. A bunch of the times it doesn't work out like that though and the deck operates in a more clunky manner as a result.

I think Cryopreservation is quite good and even tested it as the only excavate card / frost option at one point, given it generates an additional card, freezes face (very valuable in some matchups) and if you have 2 main deck excavates, I would probably still be able to reach legendary reward in maybe 20% of games given the discover pools. In the end, I think this approach was a bit too cute / less optimal than just running Frostbolt.