v - Shine vs eOnzErG in Brood War 20th Anniversary LAN comes to mind. Easy to imagine a scenario where one zerg has no buildings except a pool or a gas and mutas vs a zerg that has spores but can't mine.
v - DT vs DT where both lose mains and don't have enough to make nexus, but block ramp to another base with dt and make a pylon behind it.
v? Can't draw due to tanks/yamato i think.
here's a rare v draw: cdn.discordapp.com
v I've seen it get close with toss turtling with Mass Dark archon waiting for zerg to mine out, but it's always ended with a win for one of them.
v never seen one.