My:
2 Marsh Flats = 2 x $47.50 = $95
+ $5 in cards

Your:
3 Temple Garden = 3 x $10 = $30
2 Overgrown Tomb = 2 x $10 = $40
1 Watery Grave = $11.25
1 Godless Shrine = $10.50
Total = $91.75

Using SCG pricing, which you prefer, this is how the trade looks.

My:
2 Marsh Flats = 2 x $50 = $100
+ $5 in cards

Your:
3 Temple Garden = 3 x $12 = $36
4 Overgrown Tomb = 4 x $12 = $48
1 Watery Grave = $12
1 Godless Shrine = $12
Total = $108

Please let me know what you would like to add on my side. Thanks!

for your:
3 arid mesa
1 Marsh flats
1 aether vial
1 Serra ascendant foil

your:
01 Snapcaster Mage (35)
02 Thoughtseize 20 (40)