Strengths
He's a very mobile hero if his skill used efficiently. He could get in and out of battlefield easily where he also has higher chance executing enemy in the process.
Weaknesses
He is a very squishy hero and failing to leverage his 1st skill and 2nd skill is very punishing. He is also a one-shot killer which is not very favorable on late game since counter item can be acquired to disable Saber one-shot kill.
High Penetration
Saber has high output damage and don't engage in fight too much in early game so Sky Piercer is reasonable for first item after boots.
Penetration Jungler
This is generic emblem setup for Saber
Battle Spell
With very low HP, to compensate this, Saber need to be a jungler since he rarely goes showing himself in battlefield unless required by team.
Early to Mid Game
This build is essential for Saber to deal an absolute massive damage during early and mid game so that team can pressure the turret easier. This build is not suitable if the game exceeds 20 minutes because Saber is very squishy and can be countered in late game.
Best With Xavier
100% co-op win rate
Hero with immobilize skill is great to paired with Saber since Saber can end the enemy without any major problems getting countered.
Watch Out For Belerick
20% counter win rate
Saber cannot penetrate hero that is having a lot of HP or can sustain massive damage while also having skills to lock up Saber preventing him escape using 2nd skill.