These are some good questions. I'll go through them one at a time.
Is the mana curve to low?
The mana curve is fine. You're more likely to have a mana curve that's too high than one that's too low. As a general rule you will want most of your spells to cost around 3 mana or less, and most decks have "2" being the most common cost.
Are 33 Lands are enough?
Elf decks typically can use a lower amount of lands, because they have a lot of mana ramp. You're probably going to want a little bit more. Try to get your hands on an
Arbor Elf,
Birds of Paradise,
Joraga Treespeaker, and
Utopia Sprawl.
Do I have enough creatures? If no, where to cut?
You can probably do with a few more creatures, but the quality of cards often matters more than creatures versus non-creatures. Besides, you've got a lot of things that make tokens. Don't worry too much.
Considering your Commander experience: which cards in this deck look good in theory but bad in Commander games?
Exsanguinate.
Torment of Hailfire is better, but for this deck Lathril and the elves themselves can be a win condition, and are all you really need. You can also cut Jarad, as he doesn't add anything to the deck, as well as
Shaman of the Pack and
Skemfar Shadowsage, as they're a pretty limited one-time effect. I'm also not sure how well
Lithoform Engine will perform.
For additional things to add in,
Rishkar's Expertise is some really good card draw. It goes well with the Voltron subtheme you're cultivating.
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