Go banish and 1 rax and just pump footmen. Don't even expo... quick tech tier 3 with enough towers to deter any base attack/harass--usually 3 or 4. Have your blacksmith pump the weapons upgrade for foots/gryphs. When you reach a critical mass of foots... like about 12, rush into their base with defend and nail as many burrows as you can (you might have 2 gryphs by this time as well, which only makes the @%@! harder.
Any time the blademaster pops up, banish and siphon mana. Keep him banished the whole fight if you can. And when he runs out of mana, start siphoning the shadow hunter. Their mana adds to your own and keeps you banishing the blademaster. So orc loses their dps and their economy. After your foots die the open food becomes 2:1 ratio gryphs to knights. Stay under 50 food of course.
At this time Orc is panicking, because their usual tactic of right clicking/netting/hexing the hero doesn't work. Heck, put a heal scroll or two on the bloodmage as well. Bloodmage has better stats than the archmage, plus banish keeps his survivability way up. Meanwhile, orcs units are totally dying to gryphs and knights with +2 weapons upgrades. Now you want to upgrade armor on the gryphs, cause he's gonna try to spam enough batriders to knock down your gryphs, so that extra armor will just frustrate him more.
Now that he's playing defensive, since you just @%@!d the economy, take an expo and lay down plenty of towers. If you're feeling frisky take another expo. Push up to 80 food, grab a staff, and let the @%@! commence. Banish the highest dps stuff and focus it down with gryphs. Any gryph he knocks down to red, staff home.
In the last game I played the blademaster lucked out on 2 +6 claws and he was still just about nullified the whole game by my bloodmage. I think it's important to solo because those extra levels mean extra stats (bloodmage has good stats and the highest dps for humans with his super fast attack speed), and extra stats mean more banish + survival. Grunts and raiders are the anvil, but without the Blademaster there's no hammer. Good times had for human player :D
Hex owns any siphoning. Sorry , but blm doesnt really work so well against experiened orcs