Yeah there are win the game combos with valakut or mazes end (any others?) but you can also just ramp to fifty mana with cloudposts

It's a nine mana sorcery. It has a huge, splashy effect (and I'm kind of grateful that spells can get this treatment still, rather than just stapling it to legs as an ETB), but I still feel like it's not going to rock the boat too much just because you already have to be pretty advanced in your ramp game to get there, or you need to cheat it at which point I think there might be bigger and badder.

The Maze's end insta-win is cute, though.

CMC 6 or higher spells (and because of it, ramp) is the main Simic archetype in Commander Legends from what I've seen, so this card makes sense there. Basically, it means you will only draw spells for the rest of the game, and you'll be able to play those spells too.

Thinning out 1/10th of your deck isn't a terrible side benefit.

i like big spells