Ogre Magi - Middle / Core

i really like the orchid idea cause give you the chance of right clicking any hero while is stunning and all the extra damage when the effect of the item is over will be massive, nice guide i really love this hero,

I'll add the Octarine Core + Orchid, now.
I'm not too sure about the refresher, OC seems good enough and a refresher doesn't seem worth the cost.

Since you're going for a carry build, you might want to get an Orchid Malevolence? Im not too sure how good it is cause I never used it before, but it gives mana regen, attack speed and int. Can't go wrong when you have right
clicking intel heros right?

Also, you might want to put heros you can rekt in lane and who you will get rekt by. I know that generally Viper is good against melee mids

Well. 3 months ago I would have told you that your build sucks.
But now I know Zaop the Witch Doctor mid player.
After getting that out of the way there are a things that I want to make clear

• The carry items are dumb except the Eye of Skadi maybe.
• A Veil of Discord will greatly increase your damage item at all stages of the game. Try to
  fit it into your build after or before Aghanim's Scepter.You don't need magic-damage dealers
  in your team to justify this item.
• You could also consider picking up the Eul's Scepter of Divinity before the
  Aghanim's Scepter.
• Seeing that this is a semi-carry guide I am a bit surprised that there is no Octarine Core
  nor a Refresher Orb.

I really like your formatting though - which I was as good with it.