I generally dont like this kind of control deck but its fun to deck build so I am going to throw a ton of ideas at you.
Protecting you: These cards will keep people from attacking you since they will have very little mana to throw around Windborn muse Ghostly Prison
Keeping your general in play: Your entire deck revolves around keeping the general in play. Mask of Avacyn
Hexproof enough said General's Kabuto
Shroud and combat damage prevention for your general, swing without mercy! Darksteel plate
indestructible, no hexproof or shroud and won't survive removal effects like Path to Exile
But will survive all board wipes and any form of combat damage. Excludes: Hallowed Burial
Sorry that card is just awesome Champion's helm
Another Hexproof with a buff since hes legendary Nim Deathmantle
Provided you have 4 mana to pay he will keep coming back onto the field with this equipped, oh wrath of god, 4 mana sorry hes back. Also gives him evasion against non-black creatures and a buff.
Other Equipment that is just plain awesome
First and foremost an absolute most for your deck... Sword of Feast and Famine
Untaps your lands and destroys the options in your opponent's hands. Strata Scythe
It is Armored Ascension
On an equipment, awesome. Sword of fire and Ice
Card draw, extra damage, can kill any utility creatures you need, and a buff with protection red/blue. Sword of Light and shadow
Pro Black, Pro White, buff (+2/+2) Minor Life gain, but most importantly, graveyard recursion. Konda's Banner
Obvious pump Umezawa's Jitte
Considering your deck is trying to keep the game very slow this card could get useful to take out enemy creatures or just go lethal with your commander. Second Sunrise
Someone pulls of an Akroma's Vengeance
or else wise lets you recover and everyone loves you for it.
Equipment/Artifact support and Shennanigans Leonin Shikari
Instant equipment speed, oh your targeting something of mine, oh no that has hexproof/shroud PureSteel Paladin
Awesome, all those instant cast equipment all 0, can switch around as you need and free Unwinding Clock
Omg yes please use this, casting spells on everyones turns with the next card Vedalken Orrery
Good without as you can cast the spells on the end step of their turns to save mana to protect your self should you have a reaction.. Stoneforge Mystic
A tutor on a stick which future lets you put equipment out on the field, most of your equipment aren't that expensive but you can do this on other people's turns and maybe for a mana or two cheaper. Kemba, Kha Regent
Overrun them with tokens.
Land destruction Global Ruin
Awesome in mono white, guess what you choose plains, if they aren't mono colored they are hurting. (most EDH decks are multicolored) This doesn't hurt you at all. Armageddon
Destroy all lands, use it when you have board advantage and you know can win Ravages of war
Just another version of the above.
Creature and land manipulation Limited Resources
More people in EDH the better guess what until this is gone no one is going past five lands muahahaha Kismet
Just slow all your opponents down especially in the land department Loxodon Gatekeeper
Creature version of the above. Winter orb
One of the most hated cards that your general is a creature version of. Storm Cauldron
Land bounce for lawls, first ability may conflict with what you want to do, just throwing that out there. Ring of Gix
Despite the fact it has echo which isnt terrible it will allow you to tap down the opponents lands and keep them locked, or stop generals from attacking you etc, with Unwinding clock
this gets nasty Icy manipulator
Superior version of the above. Scepter of Dominance
Another tap target perm Mishra's Helix
Tap X target lands tee hee. (I am enjoying the idea of this deck to much lol) Mana web
Your opponents tapped a land, well tap the rest of those that they control, more lockdown Candelabra of Tawnos
Untap your own lands Land Tax
Gets you lands out of your deck so you can keep drawing what you want.
Another mana producing artifact worth looking at Khalni Gem
Returning tapped lands doesn't hurt you too much for a double white producer.
Tutors: enlightened tutor
Get what you need. Steelshaper's gift
Equipment tutor, go get that Sword of feast and famine
Just some ideas.