https://www.mtggoldfish.com/metagame/modern#paper
1. Dredge $724.55
2. Humans $1,218.41
3. Mono-Green Tron $718.74
4. Bant Spirits $1,160.11
5. Azorius Control $1,039.34
6. Burn $429.45
7. Hardened Scales $1,021.60
8. Jund $1,742.55
Hey, but you can play Burn: true. It's a linear strategy, yet can be had for only a little over $400.
But there's so much value in UMA... I mean, it's the best set ever. Sure, but if you want to reduce the cost of one of these decks, many of the most valuable cards in them are not in UMA.
Exhibit 1: the fetchlands
In Humans, Hardened Scales, and Tron: No fetches! Nice! That's almost half the decks.
In Dredge:
Bloodstained Mire, 4, $91.80
Scalding Tarn, 3, $227.07
In Bant Spirits:
Flooded Strand, 3, $53.97
Misty Rainforest, 2, $91.18
Windswept Heath, 2, $27.72
Azorius Control: Flooded Strand, 4, $71.96
In Burn:
Bloodstained Mire, 4, $91.80
Wooded Foothills, 4, $91.96
In Jund:
Bloodstained Mire, 2, $45.90
Verdant Catacombs, 4, $222.00
Wooded Foothills, 2, $45.98
Exhibit 2: other lands
Dredge: Copperline Gorge, 4, $72.20
Humans and Bant Spirits: Horizon Canopy, 4, $239.96
Hardened Scales:
Horizon Canopy, 2, 199.98
Inkmoth Nexus, 4, $70.04
There are other cards that are not in UMA and in these decks. Just with the lands, I can describe the cat and mouse game of buying into one of these competitive decks.