Best thing you can do on a budget is play lots of ramp and card-draw. It's basic stuff that a lot of EDH players leave out, but it makes or breaks the quality of a deck. Particularly if you don't have as many "hard-hitting" cards -- your average card quality is lower than others at the table -- you need to make up for it with solid deck construction. Because no matter how awesome the cards your opponents have are, you'll be ahead of them if they miss their land drops and you curve out with a land every turn and 1-3 ramp spells in the first few turns.
That's particularly relevant for Muldrotha, because 1) you'll need a ton of mana to cast your commander in the first place, much less if it gets killed, and 2) once you have your commander, you shouldn't lack for things to do on your turn since you're casting from the graveyard. Sakura-Tribe Elder is probably the gold standard as cheap ramp that can be recurred or act as a creature, but since you're playing on a serious budget than even stuff like Burnished Hart, Dawntreader Elk, etc. can be useful.
Remember that, *if* you have your commander and lots of your library is permanents, then self-milling is sort of like drawing cards. At the same time, milling without your commander is worthless (unless you have a ton of other synergistic cards in your deck). With this in mind, find sources of mill that also do other useful things: Sidisi, Brood Tyrant might be expensive, but even commons/uncommons like Nyx Weaver, Golgari Thug, Satyr Wayfinder, etc. are pretty good for a basic deck, but I would avoid things like Homarid Explorer that don't do much of anything on their own without a way to recur them. Above all, snag a copy of Mulldrifter -- that might be one of your best cards in this deck.
Basically, fill the deck out to start with a solid skeleton of land, ramp, and mildly synergistic self-mill cards, plus a few of whatever "bombs" you own or are interested in playing with (you mentioned Woodfall Primus, the new Lazav, maybe Laboratory Maniac; frankly, there's no lack for effective bombs in these colors, whether they be self-mill things like Golgari Grave-Troll, powerful synergy game-enders like Jarad, Golgari Lich Lord, random fatties like Vorinclex, Voice of Hunger... yeah, pretty much every GB rare in the past few years). Then slowly get new cards over the years as you see fit, switching cards out on a role-by-role basis.
Private Mod Note
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Rollback Post to RevisionRollBack
"It is better for all the world if, instead of waiting to execute degenerate offspring for crime or to let them starve for their imbecility, society can prevent those who are manifestly unfit from continuing their kind. The principle that sustains compulsory vaccination is broad enough to cover cutting the Fallopian tubes... Three generations of imbeciles are enough."
--Buck v Bell, 1927. This case, regarding the compulsory sterilization of inmates at mental institutions, has -- somehow -- never been overturned. Just a wee PSA for ya.
That's particularly relevant for Muldrotha, because 1) you'll need a ton of mana to cast your commander in the first place, much less if it gets killed, and 2) once you have your commander, you shouldn't lack for things to do on your turn since you're casting from the graveyard. Sakura-Tribe Elder is probably the gold standard as cheap ramp that can be recurred or act as a creature, but since you're playing on a serious budget than even stuff like Burnished Hart, Dawntreader Elk, etc. can be useful.
Remember that, *if* you have your commander and lots of your library is permanents, then self-milling is sort of like drawing cards. At the same time, milling without your commander is worthless (unless you have a ton of other synergistic cards in your deck). With this in mind, find sources of mill that also do other useful things: Sidisi, Brood Tyrant might be expensive, but even commons/uncommons like Nyx Weaver, Golgari Thug, Satyr Wayfinder, etc. are pretty good for a basic deck, but I would avoid things like Homarid Explorer that don't do much of anything on their own without a way to recur them. Above all, snag a copy of Mulldrifter -- that might be one of your best cards in this deck.
Basically, fill the deck out to start with a solid skeleton of land, ramp, and mildly synergistic self-mill cards, plus a few of whatever "bombs" you own or are interested in playing with (you mentioned Woodfall Primus, the new Lazav, maybe Laboratory Maniac; frankly, there's no lack for effective bombs in these colors, whether they be self-mill things like Golgari Grave-Troll, powerful synergy game-enders like Jarad, Golgari Lich Lord, random fatties like Vorinclex, Voice of Hunger... yeah, pretty much every GB rare in the past few years). Then slowly get new cards over the years as you see fit, switching cards out on a role-by-role basis.
--Buck v Bell, 1927. This case, regarding the compulsory sterilization of inmates at mental institutions, has -- somehow -- never been overturned. Just a wee PSA for ya.
How much more do you want to spend on the deck?
I feel like Pernicious Deed would be great.
8.RG Green Devotion Ramp/Combo 9.UR Draw Triggers 10.WUR Group stalling 11.WUR Voltron Spellslinger 12.WB Sacrificial Shenanigans
13.BR Creatureless Panharmonicon 14.BR Pingers and Eldrazi 15.URG Untapped Cascading
16.Reyhan, last of the Abzan's WUBG +1/+1 Counter Craziness 17.WUBRG Dragons aka Why did I make this?
Building: The Gitrog Monster lands, Glissa the Traitor stax, Muldrotha, the Gravetide Planeswalker Combo, Kydele, Chosen of Kruphix + Sidar Kondo of Jamuraa Clues, and Tribal Scarecrow Planeswalkers