I figured you might be new, you still did a pretty decent job though, esp factoring in your plan with Maswood Nexus
there are tons of ways to help fix your mana. you already have
Chromatic Lantern and
Dryad of the Ilysian Grove, but there's also
Prismatic Omen. if you're looking at dorks, I'd recommend looking up 1-drops and 2-drops that can tap for any color, there are tons. you've also got
Bloom Tender, which would tap for all colors if you have The Prismatic Bridge. for lands, you've got the Bond lands (
Vault of Champions), Slow lands (
Overgrown Farmland), and Pathways (
Brightclimb Pathway), and can throw in the fetch lands from Streets of New Capenna (
Brokers Hideout), which can help you tutor and proc more triggers off of
Tireless ProvisionerThe Reaver Cleaver is not the way to go for treasures in my opinion. 6 mana just for the chance of making treasures is a lot, and that method is super vulnerable, you've got some other solid ways.
Glóin, Dwarf Emissary wouldn't be a bad idea to include
another idea is to run some of the effects where you can copy the trigger from The Prismatic Bridge (like
Strionic Resonator).
Sphinx of the Second Sun would give you a second trigger per turn, not to mention more mana and an extra card
Ratadrabik of Urborg would help with protecting your stuff.
Storm of Saruman can give you nonlegendary copies, and
Yenna, Redtooth Regent can give you a second Prismatic Bridge too. most other
clone effects can't hit your enchantment and/or wouldn't be nonlegendary
Worldly Tutor,
Insidious Dreams,
Congregation at Dawn, and
Bringer of the Black Dawn would be more ways to stack your library in addition to
Varragoth, Bloodsky Sire that you already have in the deck