Darien, King of Kjeldor has a really cool and unique effect. He's really unique, in that not many cards care about damage dealt to their controller. I'd like to add Angelheart Vial and Sun Droplet to get "damage dealt" redundancy.

Jade Monolith is PERFECT in Darien. Huge value card! If you have Darien out, this artifact can save your commander from getting burned or from combat damage. MOREOVER, you can use this on other players' combats basically to steal combat damage for yourself and make Soldier tokens!

Win Cons

Darien, King of Kjeldor, Dingus Staff, and Soul Warden serve to set up either Ashnod's Altar or Blasting Station for infinite generic mana or infinite pinging, respectively. Mentor of the Meek and Skullclamp will let you draw your whole deck, allowing you to access other win cons. Dingus Staff makes it so that you net gain tokens for each creature/token you sacrifice.

You can also use the above combo with more than one Souls Sisters effect, or Daxos, Blessed by the Sun to net gain life for every ETB trigger. That way, Aetherflux Reservoir also serves as a win con.

The simplest way to win, though, is to go wide with your creatures and soldier tokens. Intangible Virtue, Dictate of Heliod, Divine Visitation, and Caged Sun serve to beef up your attackers.

Land Ramp

Wayfarer's Bauble (battlefield)
Cartographer's Hawk (hand)
Knight of the White Orchid (battlefield)
Burnished Hart ({3}, 2 onto battlefield)
Verge Rangers (battlefield, scry-like)
Keeper of the Accord (battlefield, soldier redundancy)
Land Tax (hand)
Field of Ruin (ramps everyone)
Flagstones of Trokair (replaces itself)
Myriad Landscape ({2}, 2 onto battlefield)

Mana Rocks

Sol Ring
Arcane Signet
Mind Stone (sac to draw; 1 for {1})
Prismatic Lens
Darksteel Ingot
Skyclave Relic
Worn Powerstone
Hedron Archive (sac to draw, 2 for {2})
Caged Sun (produces none, but adds +1 Mana for each land tapped)
Smothering Tithe (Treasures)

Monarchy

Monarchy serves twofold for Darien: extra card draw and damage dealt to you.

Palace Jailer
Court of Grace
Throne of the High City

Draw

Monarchy, babey! A few of my mana rocks have the ability to sack themselves in order to draw cards. Personally, I find it hard to keep mana on the table with this deck, so I rarely use those effects. I will not list them here.

Skullclamp (tokens die, draw 2 for {1})
Endless Atlas ({T}, draw 1 for {2})
Staff of Nin ({T}. every upkeep)
Mentor of the Meek (draw 1 for {1})
Dawn of Hope (draw 1 for {2})
War Room (pay 1 life, {T}, draw 1 for {3})

Pingers

Sometimes you need help taking damage when no one wants to swing at you. Monarchy makes you a more desirable combat target.

Ankh of Mishra
Jinxed Idol (if you don't have Darien, or can't save him, sac a creature to this to get rid of the damage each turn and give it to someone else)
Angel's Trumpet (gives your creatures vigilance, pings you, encourages opps to swing out, maybe at you)
Blasting Station
Dingus Staff
Jade Monolith (AMAZING card)
Staff of Nin
Sivvi's Valor (instant, redirect damage)
Nomad Stadium
Sunscorched Desert (on ETB)
Ancient Tomb

Lifegain

Soul Warden
Soul's Attendant
Anointer Priest (tokens)
Daxos, Blessed by the Sun (ETB & leaves)
Impassioned Orator
Suture Priest (Pings opps)
Ajani's Welcome

Create Tokens

Keeper of the Accord
Dawn of Hope (lifelink)
Court of Grace (angels if you have Monarchy)
Divine Visitation (careful about Smothering Tithe's Treasure tokens!)

Removal

Palace Jailer (creature, for as long as you have Monarchy)
Catapult Master ({T} 5 soldiers to exile a creature)
Conclave Tribunal (nonland permanent)
Path to Exile (creature)
Forsake the Worldly (artifact/enchantment)
Generous Gift (any permanent)
Return to Dust (artifact/enchantment)

Wipes

Cleansing Nova (creatures OR artifacts/enchantments)
Fumigate (creatures)
Austere Command (artifacts, enchantments, creatures)
Hour of Revelation (nonland permanents; can cost less)
Hour of Reckoning (nontoken creatures; can be free)

Misc. Value

Cloud Key (makes a card type cost {1} less. probably name artifacts/enchantments)
Sun Titan/Emeria, the Sky Ruin (return creatures from GY)
Field of Ruin/Ghost Quarter (nonbasic land hate)
Path of Ancestry (scry when you cast a human? p good)
Windbrisk Heights (easy to swing in with three creatures in Darien, get something for free, possible to set up with combos)

Basically everything else in the deck is there for beefing up creatures and tokens or protection.