Power Deadeye is a strong roamer that takes advantage of Binding Shadow and Be Quick or Be Killed to lock down and eliminate targets quickly. Deadeye benefits from the baked in mobility of any thief spec, however is is vulnerable to focus and gets countered by projectile block from builds like Tempest or Harbinger .
As a roamer, Deadeye focuses on moving around the map and quickly getting kills. In order to do this, you need to lock down and eliminate your target as quickly as possible. Deadeye relies on a mechanic called malice to do damage. Whenever you mark a target, hitting them with an ability will generate stacks of malice. At maximum malice, your stolen skills will give you stealth and Death's Judgment will do 75% more damage. Try to build malice as quickly as possible after marking a target for maximum effect.
Your have other hard and soft cc, but it is used less commonly. Malicious Tactical Strike is a daze if you hit from behind, but it spends your malice for relatively little impact. Kneel gives access to Spotter's Shot which can be used in conjunction with Sniper's Cover to immobilize and blind a target.
Withdraw is your best source of sustain both for its healing and cleanse. Keep in mind that Withdraw is also a mobility skill, and can be used with camera control techniques like About Face as a positioning tool. Mug doesn’t heal for much, relatively speaking, but it can be continually reset by your traits and Mercy , meaning you can heal considerably over time. Steal Health, Steal Durability, and Steal Defenses are also valuable as defensive tools, but they depend on your matchup. Steal Health is especially good since many games have 3-4 necromancers in this meta.