Pro-wish individual here. I make all my decks with it in mind (10 pre-selected cards, adhering to Commander based card restrictions). The individual functions of each deck's set cards differ, but they usually follow the same idea: some way to draw cards, some way to recur cards, something dealing with land, a big effect or two (probably finishers), some cards that are highly synergistic with the given Commander. These 10 cards also represent the deck's flex slots, in the sense that I can shift new cards into them and if the card underperforms or is never the desired target it can be just cut. On the other, if it is commonly the only card I want from that stack of cards, I might need to think about putting it in the main deck.
Here are the lists for the four decks I currently consider playable. I am still working on refining them, but I feel Sen Triplets is the tightest list, while the others still need a fair bit of work.
I see you are pretty much treating it as mono-black, but with your infinite mana combos running on artifacts, having artifact creatures and running Crucible of Worlds, would Academy Ruins interest you?
I took Meren as once a turn gravedigger that can be removed before it can dig and that can't be larked, but after thinking about it a bit more, I can see the appeal. If you recur Meren a few times, you will likely get to the point where creatures are going directly into play, which is a vast improvement over the digger. Only real problem I have at that point is lack of value for recurring it multiple times per turn. Of course with Karador's mana options I would be tempted to run Daxos along side Meren, that would likely take a dedicated enchantment package though...
I am kind of partial to the Centaur Vinecrasher, I just don't know if it will do enough.
If you are up for another high cost creature Eternal Dragon's ability to return to hand might interest you.
With your mana doublers and anthems, I thought it strange you didn't have a big token spell in the deck, Decree of Justice or White Sun's Zenith due to their instant speed perhaps?
Well, the deck has gone thru several revisions, but with the release of Theros
and Ashiok I felt I needed to update this list to the current version.
-Inkmoth Nexus, +Thespian's Stage It was VERY rare that this land did what it was suppose to do, some of those times it probably would have ben easier to win via regular damage
-Blinkmoth Nexus, +Riptide Laboratory I noticed I had a small wizard tribal, and it protects Sen Triplets
-Fiend of the Shadows, +Nightveil Specter Losing the ability to cast it 'forever' might hurt, but the random factor has been fun
-Acquire, +Daxos of Meletis Sort of has evasion, life gain is nice, and I don't need Dawn to pull it off
-Desertion, +Pulsemage Advocate This card has to be one of the best example of EDH making a card playable. If Sen Triplets is out, and you activate him, you get your creature back as usual, but assuming you put cards into the target of Sen Triplets hand, you basically drew three cards as well
-Jester's Cap, +Ashiok, Nightmare Weaver I love titanable planeswalkers, so without even reading Ashiok, I wanted one in the deck. Then I actual read what the cards does... ... A 'walker that is a perfect fit for the deck
-Glen Elendra Archmage, +Snapcaster Mage The extra counterspells were nice, but flashing back removal has been very handy
-Mind's Eye, +Blind Obedience I like the haste prevention, along with the health taxing
-Mnemonic Wall, +Archaeomancer A swap that added to the wizard tribal
-Sword of War and Peace, +Haunted Plate Mail War and Peace was very hit and miss for me, the Plate Mail has done alright so far
-Wurmcoil Engine, +Treasury Thrull With the slight bend towards attacking to steal things, I figured another attack trigger couldn't hurt
Here are the lists for the four decks I currently consider playable. I am still working on refining them, but I feel Sen Triplets is the tightest list, while the others still need a fair bit of work.
1x Command the Dreadhorde
1x Mnemonic Betrayal
1x Primevals' Glorious Rebirth
1x Rhystic Study
1x Sword of the Meek
1x Sydri, Galvanic Genius
1x Teshar, Ancestor's Apostle
1x Vesuva
1x Wurmcoil Engine
1x Eternal Dominion
1x Grapeshot
1x Manifold Insights
1x Past in Flames
1x Saheeli's Artistry
1x Spelltwine
1x Subterranean Tremors
1x Treacherous Terrain
1x Wildest Dreams
1x Beast Within
1x Descent into Madness
1x Dictate of Erebos
1x Illusionist's Bracers
1x Rakdos Charm
1x Tectonic Break
1x Triumph of the Hordes
1x Vandalblast
1x Wildest Dreams
1x Bloodgift Demon
1x Maga, Traitor to Mortals
1x Mikaeus, the Unhallowed
1x Miren, the Moaning Well
1x Necrotic Ooze
1x Pharika, God of Affliction
1x Riftsweeper
1x Woodfall Primus
1x Worm Harvest
I am kind of partial to the Centaur Vinecrasher, I just don't know if it will do enough.
With your mana doublers and anthems, I thought it strange you didn't have a big token spell in the deck, Decree of Justice or White Sun's Zenith due to their instant speed perhaps?
and Ashiok I felt I needed to update this list to the current version.
-Inkmoth Nexus, +Thespian's Stage It was VERY rare that this land did what it was suppose to do, some of those times it probably would have ben easier to win via regular damage
-Blinkmoth Nexus, +Riptide Laboratory I noticed I had a small wizard tribal, and it protects Sen Triplets
-Fiend of the Shadows, +Nightveil Specter Losing the ability to cast it 'forever' might hurt, but the random factor has been fun
-Acquire, +Daxos of Meletis Sort of has evasion, life gain is nice, and I don't need Dawn to pull it off
-Desertion, +Pulsemage Advocate This card has to be one of the best example of EDH making a card playable. If Sen Triplets is out, and you activate him, you get your creature back as usual, but assuming you put cards into the target of Sen Triplets hand, you basically drew three cards as well
-Jester's Cap, +Ashiok, Nightmare Weaver I love titanable planeswalkers, so without even reading Ashiok, I wanted one in the deck. Then I actual read what the cards does... ... A 'walker that is a perfect fit for the deck
-Glen Elendra Archmage, +Snapcaster Mage The extra counterspells were nice, but flashing back removal has been very handy
-Mind's Eye, +Blind Obedience I like the haste prevention, along with the health taxing
-Mnemonic Wall, +Archaeomancer A swap that added to the wizard tribal
-Sword of War and Peace, +Haunted Plate Mail War and Peace was very hit and miss for me, the Plate Mail has done alright so far
-Wurmcoil Engine, +Treasury Thrull With the slight bend towards attacking to steal things, I figured another attack trigger couldn't hurt
The poster above couldn't think of a card name, presumably KotR, and I hate not knowing the names of things so I figured I would help them out. Noted.