Nuker is a "Soldier" unit, his main role is damage the enemy nexus.
Passive: Melee is Silly
Does high amount of damage from a distance
Active: Throwing Vibes
Increase all attack units range for a short period
Tactics:
passive - Attacking from a distance can be really usefull as it help minimizing the path the unit need to travel and the amount of hit it can take.
active - "Throwing Vibes" benefit all of the units on the field granting them some attack range.
using it too soon means it will be over before units will reach the require distance from nexus.