Current Decks:
B: Gonti, Lord of Luxury (Fiddling around with black flicker/repeated raise dead effects like Oversold Cemetery or Palace Siege to play him a bunch. Mostly just a fun deck and each game is a bit different since you get to play other people's decks)
U: Hakim, Loreweaver (Mono-U Dredge, Voltron at low-power tables, infinite Treachery Combo silliness at higher-power tables. No matter how many times I assemble Pemmin's Aura+Charisma+Hermetic Study I can't help but smile.)
R: Homura, Human Ascendant (One of my earliest EDH decks, Purphoros is way better at the tokens thing than he is, but I keep him out of nostalgia. And love of giving Double-strikers flying and firebreathing. It's fun playing Quakes in a tokens deck.)
G: Sekki, Seasons' Guide (Commander-Synergy, light Spirit-synergy, not really tribal)
W: Odric, Lunarch Marshal (Started as "Achievement Hunting" to try to get all 13 keywords, but after I did it a few times, decided to just re-engineer it to a sweet trait-stick, slight soldier-tribal theme deck. Turns out giving your entire table Flying, Double Strike, Lifelink, Death Touch, and Trample tends to make you table target.)
X: Karn, Silver Golem (Artifact Shenanigans. It's like a run-down muscle car for your dad; every long-time EDH player has this deck sitting in the garage with its guts torn out being tinkered with for years but never quite coming together)
B/U: Ramses Overdark (WoW Shoulderpads, Commander-Synergy, low-power-level deck)
B/R: Olivia, Mobilized for War (Hellbent abuse, although cards that actually say hellbent tend to suck. Ghirapur Orrery was a yoooooj pick-up in Kaladesh)
B/G: Mazirek, Kraul Deathpriest (Eldrazi Tribal. Scions and Spawn pull great double-duty with this guy. Cryptic Gate'ing Titans into play is smiles.)
B/W: Selenia, Dark Angel (Life Matters, all the Mirror Universe effects, some of the less-horrible Lich effects. Repay in Kind for funsies. Casting Cost reductions to turn Selenia into a 2mana "creature ltb/etb" trigger-er (Door of Destinies is fun).)
U/R: Space Reserved For Aether Revolt and a hopeful U/R Artifact General, was Arjun Spellslinger but I dismantled it to move cards over to the next general...
U/G: Rashmi, Eternities Crafter (Spellslinger. I love this commander, although the current deck is a bit too "Goodstuffs" for my taste)
U/W: Hanna, Ship's Navigator (Pillow Fort/Stax)
R/G: Mina and Denn, Wildborn (Lands Matter, boring, but enjoyable)
R/W: Brion Stoutarm (Steal n' Sac, featuring my bff, Preacher)
G/W: Sigarda, Heron's Grace (Asshole control/combo pretending to be durdly human tribal)
B/U/R: Marchesa, the Black Rose (Commander synergy. I adore this deck, there's like 180 cards I want to play in it.)
B/U/G: Sidisi, Brood Tyrant (Graveyard Matters, bunch of stuff that scales off yards, some self-mill stuff, several "shuffle my own graveyard in" effects to help dodge rampant graveyard removal)
B/U/W: Dakkon Blackblade (LOOK AT THIS MAJESTIC MOTHERFUCKER. HOW DO YOU EVEN DEAL. Lands Matter, with a special subtheme of Swamps Matter. Urborg, Tomb of Yawgmoth+Karma is fun times.)
B/R/G: Kresh, the Bloodbraided (Fight Club)
B/R/W: Alesha, Who Smiles at Death (And Taxes)
B/G/W: Ghave, Guru of Spores (I'VE BEEN TRYING THALLIDS FOR 20 YEARS GOD DAMNIT. This was actually a Daghatar the Adamant "+1/+1 Counters Matter!" Deck when I was trying to have one Khan's deck from each tribe, but yeah, they don't make tables low enough powerlevel for Daghatar to unsuck.)
U/R/G: Yasova Dragonclaw (Steal shit, punch faces, flicker it to keep it forever)
U/R/W: Shu Yun, the Silent Tempest (Heroic/Prowess Shenanigans, with all the shit that makes token creatures when you cast a non-creature spell, combined with Buyback Spells that get cost-reduced to one colored mana and target creatures. Rarely comes together, but when it does it's glorious)
U/G/W: Phelddagrif (Combo/Control/Voltron/Synergy/FuckGroupHugI'mAHippo)
R/G/W: Hazezon Tamar (Explosive tokens deck. Also contains several other cards whose text are garbled gibberish thanks to the passage of time. "Gatherer Text" Deck.)
B/U/R/G/W: General Tazri (Not really an ally deck. Tokens deck with Tazri tutoring for Zada, Hedron Grinder, Turntimber Ranger, or Mirror Entity for combos/overruns. Conspiracy or Xenograft for Allies can also just let Tazri pump the bejeezus out of her tokens.)
I try to keep myself to one deck of each color combo to keep my land-requirements sane. Looking forward to seeing how they do the new 4-color generals. B/U/G/W is probably where I'll finally build a current Enchantress deck, or a +1/+1 Counters Matter deck.
I need 10 more Crucible of Worlds ~_~
My pet terrible card is Tawnos's Coffin, of which I have 9 currently in use. Maybe 3 of them actually deserve to be in their deck, but god damnit I love em.
My decks are all ugly, since I buy the cheapest copies of each card I need that wasn't already rotting in my collection boxes. "Cigarette burn in the middle of the art? I'll claim it's 'alt art'!"
Except Gonti, Gonti's getting pimped, because how else does one build a Lord of Luxury?
I run a Magic Club for the kids at the school I work at, and am the defacto TO for my friday night store, so I keep a good-sized roster of EDH decks on me to lend out to folks. Double sleeved. Bought a bunch of ultra pro satin towers last Black Friday, and use mix-n-match lids/center bits interchangeably to color-code the decks. Usually at least 3-4 of these decks are at home in the card room, laid out on the table and being tinkered with. Pretty much always Karn.