Higher life totals and more players make traditional creature threats such as Tarmogoyf pointless, while the shifting value of card advantage means that one-for-one removal doesnt maintain parity, but rather always trade downwards
On the flip side, blue still has access to colorless cards, which bolster the somewhat limited selection
Wrench: Cheap vigilance, relevant activated ability, and able to be traded for a card in a pinch
It has ended a lot of burn players games with the old seven life and find a recursion dork into repeat seven life casts
While I believe the ultimate is very powerful, I worry that building towards it might be futile, as I have a hard time imagining an entire table is going to just let it happen
I would only really consider this in a deck where all my top end threats cost 10 or more mana and I also had things like Channel