Starcraft 2, like it's predecessor before it, has a very robust level editor that allows you, the DIY modder, to create nearly any scenario within the bounds of the Starcraft 2 engine that you could imagine. We have compiled videos on how to do all sorts of fun things with it, from making RPG's and Tower Defense games to just making you dream Starcraft 2 level. This video will teach you how to create a condition in a custom map where waves of zerglings will attack the heroes continuously. If you want to create a mod where your heroes are constantly harried by Zerg, this is the video series for you.
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