The OP never mentioned anything about the AI, so don't feel so constrained. Feel free to download replay packs from last summer, load them up into EB, and draw your sketches. There are some particularly interesting clashes that occurred. If you chose to load 'em up, make sure you've got the right files (EDU and whatnot).
EDIT: Tanit mentions campaign and custom battles. If you ask me, the latter encompasses both AI and human opponents.
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