@childe_roland My reasoning here is bi-fold. First, the way I approached building the list was trying to maximize the cards that can come out of the graveyard as a recursive spell thereby helping the deck move forward and also helping the deck protect against counterspells by making them worse to point at a recurring spell.
Second, if it wasn’t a recursive spell or restricted (I.e. null rod, exploration, etc.) I wanted it to be a card I could run in multiples to have a better chance of drawing because the deck isn’t great at searching cards, and also be able to play more than one if it got countered or a card that simply couldn’t be countered. Furthermore I wanted all the spells in the deck to generally stay at a cost of 2 or lower (only card that costs three is Krosan grip which I want because it’s guaranteed hate, I’ve cut beast within). That might sound crazy in a deck with 35 lands but a lot of the lands either don’t produce mana or don’t stay in play and if I can’t land a fastbond effect saying play land go for three turns just feels awful to play a spell that costs three. I have had plenty of games where I have had a huge abundance of lands but it’s not always the case.
In my eyes looking at crucible through this lens it had several drawbacks. 1) it was above my curve with no built in defense 2) it was a card that was almost guaranteed to get countered and it couldn’t be recurred 3) it was a card I didn’t want to run in multiples because it took spots away from other cards I really wanted in the build 4) it was a repetitive effect to the loams to some extent and I like loam a lot better with Bazaar 5) I didn’t need it for my good matchups and it felt weak in my bad matchups. What I mean here is there was a good possibility I wasn’t going to cast it against shops either due to spheres etc and would rather have loams and I never felt like I needed it there, and against dredge I just didn’t need it. Against blue it was another card to counter that I had put extra resources into and couldn’t protect meanwhile taking turns off of wastelanding them or playing a combo piece in order to get up to the requisite mana.
Yes, I will admit the card definitely has synergy with the deck and if you could land the card it is probably game over for the opponent. I will also admit that I have seen people including myself in prior builds try it and Ramunap excavator. In the end I just didn’t like it for too many reasons and wanted to be on the loam plan and stick to my build parameters to make the deck as low and streamlined as possible.
I’m not saying this is correct it’s just my opinion and I encourage you to try it if you’d like. Scary things can definitely occur with that card in play.