phyrexian reclamation may be the budget route, could eventually get up to multiple burnished cast+sac per turn, and skips the required drawstep. If he doesn't plan on using many creatures although then it would be a pointless inclusion.
Ashnod's Altar, while doesn't make mana on its own, I find it quite useful with early tokens. I haven't checked the price of Gauntlet of Power, but if you can get one it'd help a lot also. EDIT: Slightly over $10 from TCGPlayer.
If you average out the costs, Cabal Coffers and Expedition Map are below $10 each. Coffers is far and away the best ramp in mono-B and is worth including a dedicated tutor for. I've definitely built mono-B lists around that card. Coffers, Deserted Temple, Petrified Field, Vesuva, Thespian's Stage, Grim Discovery, etc. You're probably not going for all of those on a budget, but Coffers at least is worth saving up for.
Fellwar Stone should always produce black mana. If your meta is weird, at the very least you get one colorless, a Mind Stone without the second ability.
Honestly though, you probably are best to get the ultimate mana producing suite of all time in Urborg, Tomb of Yawgmoth, Cabal Coffers and Expedition Map. Nothing else compares. I guess it depends how important the deck is to you whether you spring for this stuff or not.
As others have mentioned, Cabal Coffers is really the best mono-black ramp card there is. It's only a few bucks over $10, but is well worth it. Another card that hasn't been mentioned yet, but Nirkana Revenant would be a good one. Again, this is currently about the same price as a Cabal Coffers (~ $14 - $15), but an excellent ramp card nonetheless.
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"Be silent, thou accursed wolf;
Consume within thyself with thine own rage."
-Dante's Inferno (Canto VII)
I endorse Dark Ritual 100%. You don't need a way to abuse it, it's a better Mana Vault in mono B. Make sure and include enough card draw in your deck to overcome the card disadvantage that it causes, but it's a great way to power out that turn 2 Crypt Ghast or early mana rocks.
Kuro, Pitlord just struck me a feasible Commander if I could ramp up to it. It also seems like a good mono-Black removal-centric Commander for some kind of control deck.
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Your new prescription eyeglasses don’t work. You still can’t see things my way.
Kuro, Pitlord just struck me a feasible Commander if I could ramp up to it. It also seems like a good mono-Black removal-centric Commander for some kind of control deck.
I thought you were going for style points with Kuro since he is normally not used as a general, normally in the 99 of Iname, Death Aspect. Even so, kudos to you for using him. Kagemaro, First to Suffer is also a good removal choice which you could run in your deck.
Crypt Ghast
Magus of the Coffers
Bubbling Muck
Caged Sun
Black Market
Crypt of Agadeem
Nykthos, Shrine to Nyx
Liliana of the Dark Realms
Trap your friends in an endless game with this 23-card combo!
Links to my most current deck lists;
Primary EDH; Rakka Mar Token Perfection, Crosis Mnemonic Betrayal, Cromat Villainous, Judith Gravestorm, Rakdos Empty Storm, Exava Artifacts, Bant Trash, & Fumiko Voltron!
EDH kept at home; Ruzzian Isset & Rakdos LoR!
EDH (nostalgic/pimp/retired) in storage;
Latulla Burns, Akroma Smash, Jeska Voltron, Rakdos Storm, Bladewing Darghans, Lyzolda Worldgorger, Xantcha Steals your Heart, Jori Storm, Wydwen Permission, Gwendlyn Paradox, Jeleva Warps, & Sigarda Brick!
Legacy Showanimator and High Tide!
While not cheap Volrath's Stronghold is funny with those two
This aint your girlfriends meta! This is a man's meta! TURBO META.
Links to my most current deck lists;
Primary EDH; Rakka Mar Token Perfection, Crosis Mnemonic Betrayal, Cromat Villainous, Judith Gravestorm, Rakdos Empty Storm, Exava Artifacts, Bant Trash, & Fumiko Voltron!
EDH kept at home; Ruzzian Isset & Rakdos LoR!
EDH (nostalgic/pimp/retired) in storage;
Latulla Burns, Akroma Smash, Jeska Voltron, Rakdos Storm, Bladewing Darghans, Lyzolda Worldgorger, Xantcha Steals your Heart, Jori Storm, Wydwen Permission, Gwendlyn Paradox, Jeleva Warps, & Sigarda Brick!
Legacy Showanimator and High Tide!
Shu Yun, the Silent Tempest WUR Voltron Control
Temmet, Vizier of Naktamun WU Unblockable Mirror Trickery
Ra's al Ghul (Sidar Kondo) and Face-Down Ninjas
Brudiclad, Token Engineer
Vaevictis (VV2) the Dire Lantern
Rona, Disciple of Gix
Tiana the Auror
Hallar
Ulrich the Politician
Zur the Rebel
Scorpion, Locust, Scarab, Egyptian Gods
O-Kagachi, Mathas, Mairsil
"Non-Tribal" Tribal Generals, Eggs
Otherwise, the usual array of mana rocks are good. Worn Powerstone, Thran Dynamo, Gilded Lotus, Everflowing Chalice, etc. You can safely go for some pretty big rocks with Kuro's CMC and upkeep cost.
(U/B)(U/B)(U/B) JUMP IN THE LINE, ROCK YOUR BODY IN TIME
(R/W)(R/W)(R/W) RISING FROM THE NEON GLOOM, SHINING LIKE A CRAZY MOON
(U/R)(R/G)(G/U) STEALIN' WHEN I SHOULD HAVE BEEN BUYIN'
Extraplanar Lens
Liliana of the Dark Realms
Liliana's Shade - almost the only black land search
Sword of the Animist if you have fodder you don't mind swinging with - Nether Traitor?
Lake of the Dead - not sure what this costs these days...
Crypt of Agadeem
Magus of the Coffers
Phyrexian Altar - still pretty pricey, but not quite as bad as the coffers and tomb.
I wouldn't recommend it as a fantastic option, but there is Dark Ritual too. Much better in a 60 card format. I'd only play it if you have a reliable engine to copy it abusively.
For colourless ramp, there's Pawn of Ulamog, Sifter of Skulls and Corpsehatch.
Honestly though, you probably are best to get the ultimate mana producing suite of all time in Urborg, Tomb of Yawgmoth, Cabal Coffers and Expedition Map. Nothing else compares. I guess it depends how important the deck is to you whether you spring for this stuff or not.
"Be silent, thou accursed wolf;
Consume within thyself with thine own rage."
-Dante's Inferno (Canto VII)
Out of curisoity, why Kuro, Pitlord for your Commander?
Mid-Tier: Marchesa Aggro Rose Asmadi Get Dire Tymna Ikra Woke Women Tiana Aura Angel Ruric Thar SMASH Smasher Kraum Mana Positivity Zur Slides
Filthy Casual: WUBRG Jodah WUBRG WUBRG Fatties WUBRG Gahiji Vigilant Vengeance Ezuri Mysterious Morphs
I thought you were going for style points with Kuro since he is normally not used as a general, normally in the 99 of Iname, Death Aspect. Even so, kudos to you for using him. Kagemaro, First to Suffer is also a good removal choice which you could run in your deck.
Beating Face with Bane
Beatrice, the Golden Witch