I imagine lightning being red is mostly a facet of WotC's unwillingness to let any color other than red deal damage.
Lightning Bolt is probably an aerothurge spell, and that would be blue, but we can't have U: deal 3 damage.
You can kinda see this in how they're struggling with blue dragon...
Depending on the look of lands you're looking for, you could go search for something on Artstation.
I take a lot of my stuff from the imaginary network, they've got a lot of dedicated landscapes subs, but I don't think there's one for "Swamp"
Classes solidify my interpretation that between these and Ornithopter of Paradise I feel like there's a job listing on WotC's website right now for "Card Namer" and they're just desperately struggling until they find someone
Interesting though. They've spoiled allied, enemy and monocolor...
Honestly I've mostly seen these as fine. Some of them are a bit excessive:
Like yeah, that's what I need. the possibility of THREE heat shimmers on an otherwise middling body.
But like this guy?
Oh wow! I crit and get 8 mana on turn 5
That's good, certainly, but nothing outside the acceptable...
on that note actually:
Like this and Dive down (which I'm playing at the moment) both have modes, but I think I like this one more?
For posterity, here's the (almost) full cycle (we don't have green)
Also this looks interesting:
Phoenix of Ash provides a sticky hasted scaling 3 drop, and...