I don't see how zerg can beat anything. protoss and terran completely overpower it. Zerglings? I once killed 5 lings with one zealot. Lurkers? By that time people will have detectors unless you're newb. Tanks kill it. And basically it dies very quickly and very expensive. Mutalisks? Costs a lot. Dies by a few turrets or cannons. Hydralisks? Can't beat tanks and marines and medics... or dragoons and dts and zealots Guardians? the protoss/terran was a newb to let you get so many guardians... and can be countered with anti-air. The only thing that I can think of that's good is defliers with Dark Swarm. And even then by the time you tech that high. Terran and Protoss has powerful units like battlecruisers and archons etc. Ultralisks btw are a waste of money.