The Antorak Maurader can create a phase node when it hits level 6, allowing you to instantly jump out at the sign of trouble. It also has Distort Gravity, allowing a small raiding escort fleet to move extremely fast through enemy territory and Subversion which effectively disables enemy production at the afflicted gravity well.
Also, take a look at the Subverter/Ruiner combo. Use Subverters+Antoraks to disable the enemy fleet and then use Ruiners to blanket the enemy fleet in mines.
Another example of fighting dirty would be the Kortul which is effectively the omni-counter. It heals itself, drains AM, increases ability cooldowns, nullifies strikecraft, and punishes frigate spam.
Phase Gates themselves are somewhat dirty and allow flanking that the other races can only dream of, not to mention the fact that they spawn units.