This foretell-themed precon from Kaldheim is arguably the best value deck available at the moment, and it plays extremely well out of the box
The biggest one of these has to be Marit Lage's Slumber
But if you have other mana sources, hold on to it to use its channelling ability at instant speed and destroy a key part of your opponent's engine
Perhaps the best thing you can do with all that mana, besides dumping it into a massive Finale of Devastation, is to put all that mana into a Helix Pinnacle, which once you put 100 mana into it, you just win the game
Pull from Tomorrow is also the perfect way to dig for the Approach of the Second Sun that you cast the turn before and put back into your library
If everyones throwing cards at a win condition and the owner has an out, counter both the out and the win condition