I'm a bit late to reply but curious if you ever solved this. I am working on a similar idea, but also trying to include enough mountains for Chained to the rocks. I tend to be greedy, but it's more fun that way. Here's what I'm thinking. Could be too many basics due to the mountain requirement but I'm just starting to test now.
4 evolving wilds
2 mardu tri land
4 jeskai tri land
3 flooded strand
3 bloodstained mire
3 mountain
1 swamp
2 island
2 plains
16 red sources (10 mountains)
15 white sources
13 blue sources
10 black sources
10 tapped lands
Mana confluences or pain lands could also be correct, perhaps in place of a plains or island.
Red: 16
White: 14
Blue: 12
Black: 10
8-10 tap lands
24 lands total.
As for the actual deck, I'm just trying to see if it's feasible for Jeskai to splash black for Crackling Doom.
4 evolving wilds
2 mardu tri land
4 jeskai tri land
3 flooded strand
3 bloodstained mire
3 mountain
1 swamp
2 island
2 plains
16 red sources (10 mountains)
15 white sources
13 blue sources
10 black sources
10 tapped lands
Mana confluences or pain lands could also be correct, perhaps in place of a plains or island.
Thoughts?