If you’re having trouble beating Zerg as a Terran player, give this unique strategy a try. At first it doesn’t seem very effective to mass up a lot of Ravens, but when you get a lot of them they are extremely powerful.
Start off with this build order: Barracks 12, Refinery 12, Factory when you get 100 gas, then another Refinery. When the Factory is done build 2 Starports and put Tech Labs on them. Then start making Ravens. You’ll have a lot of minerals left over, so make Marines to defend and help attack with.
Once you get 3-4 Ravens move out into the Zerg base and lay down a bunch of Auto-Turrets while you attack with your Marines. It can be very effective to make a Medivac and drop some Marines right into the Zerg main base to surpass defenses. Do as much economic damage as you can.
Keep the pressure on throughout the game, harassing with Auto-Turret drops. Don’t be afraid to use all your energy on them, the more Turrets there are the more effective they become, and Ravens get energy back fairly quick. As you expand and get access to more Refineries, start researching upgrades to make your Ravens more effective. Seeker Missile is great against tightly packed units and getting the building upgrade at your Engineering Bay can help your Auto-Turrets live longer.
As you mass up Ravens you’ll have a lot more energy to play with, being able to lay down a lot of Turrets and cast a lot of Seeker Missiles. Move around with your Marines and Hellions to kill off Creep Tumors and slow down the Zerg army while your Raven energy is charging. The key to winning with this strategy is to be very aggressive and keep pressuring your opponents bases where they have to fight and can’t simply run away from your Ravens’ spells.
To win games at higher levels you’ll have to really focus on your macro while you do this strategy so you have lots of Marines and Hellions to support your Raven army. If you let your macro slip you could be in for some trouble as Zerg may just outmass you.