American protoss player Arium showed us during this year's Dreamhack Valencia how to annihilate an entire Zerg army and win a match with two protoss Immortals and a single Warp Prism.
And this wasn't just a random game. He played against one of the best zergs out there: the Korean GSL veteran Symbol.
Arium (who's actually very young, only 15) used the protoss transport unit incredibly well to save those Immortals against the zerg army. But you can watch his Warp Prism micro in SC2HL's highlight video, and the whole match over here.