As far as artifacts and lands to avoid, there's not much. I mean, as long as you guys have fun with the cards and the cube is an enjoyable experience, you're doing it right. I would caution against overdoing lands that enter the battlefield tapped though, if you want aggressive decks to be playable in more than one color.
Cheers, and happy cubing!

Beleren > Mage.
Shatter > Decrease.
Nothing has really changed, except the speed of the cube has made 1cc ramp even more desirable than ever. So in that sense, I guess I "ran out of dorks". 1cc ramp is just good, and I already play all the Llanowar Elves I want to. I like them more than the mana dorks that have a drawback or tap for colorless, but not more than the creatures that unconditionally produce colored mana. I do play Pilgrim (in
Elvish Reclaimer is also a decent support card for this kind of package.
Most of 'em are.
https://www.cubecobra.com/cube/deck/62237470b875b510034a180a
It can also boost big late game land counts for Uro and Krasis if we make it to that stage of the game, as well as serving as a fuel engine for Uro and Forbid.
The whole is greater than the sum of its parts.
2) It can, but typically it'll see play in decks that have both good land targets and can use it to feed the 'yard.
And as long as they keep printing things like Urza's Saga, Boseiju, triomes, etc. it's only going to continue to get better and better.