Iso is similar to Reyna in the sense that his abilities are only effective if you know how to aim. His ‘double tap’ ability is a shield that basically activates. It is a timer, and if you get a kill within that time and hit the orb, it activates your shield. His ultimate is one of the most unique in the game. Iso hurls a column of energy that pulls the first enemy he hits into a 1v1. Both players are stripped of their abilities and must rely on pure aim to win that interaction. If he wins, he returns to the map with his shield active. He also has a wall that blocks shots, which allows him to enter the site. It is an extremely useful ability to enter the site because it blocks the players views and shots.
Tenz is another example of one of the best players with Iso. Although people can argue that his aim and game sense aid in his ability to be so good, I think that because of that, he is extremely good with every duelist.