I have an idea for the best/worst hero, Merlot the Drunken Wizard. First, fanfiction.
Back when he was known as the Echo Magus, Merlot attempted to challenge Rubick. He believed he was undefeatable by any mage, with his talent to reflect any spell back at its caster, and would not sit while idle while anther claimed the title of 'Grand Magus'. The fight was going in his favor, until something he didn't expect happened. Rubick was able to mimic his ability to reflect. A shot he fired off soon began to bounce between the two of them, and then anther, and anther, until the room was alight with the magics. All he had to do was outlast Rubick to finish him off once and for all, but try as he might that time never came, and eventually conceded defeat. A broken man, he renounced his title and sought to simply drown away his sorrows for the rest of his tired days. And he would of had his way too, if not dragged to this bloodly battle by some barkeeps's ill-mannered 'enforcer'.
Now, the OP spells.
Q: Cacophonic Beam. Merlot fires a set of powerful and narrow piercing beams in the direction his enemies are. The spell has a 100 degree cone of variation from where it was aimed for the direction it will go, and is 25 units wide. The spell's damage is reduced for each target the beam passes though. Units will take less damage for beam they get hit by from a single cast
350 Damage (250/150/50 for each successive beam hit in one cast)
1/2/3/4 Beams, (.25 seconds apart, chaneling, will stop shooting if stunned)
250 Mana
6 Second Cooldown
W: Resonance: Merlot Teleports a random distance in the direction he choices, from 100 to 1700 units, damaging any unit he lands on
100 Mana
20/15/10/5 second Cooldown
100/150/200/250 damage in 300 AoE
E: Echo Shield: If proced, Merlot reflects a spell back at his enemy.
Targeted projectiles will fly back to the person who casts them. Untargeted projectiles will have the effect instantly applied to caster. Instant abilities will be casted on caster. AoE Abilities will reflect the damage/effect of the tick that procs the shield. Hook will pull Pudge to him. Works on items.
10%/15%/20%/25% Proc chance
4/3/2/1 second cooldown
R: Resound: Merlot is able to fully regain his former composure for a brief period. Cacophonic Beam will go in the direction he points, Resonance will teleport him to where he clicks, Echo Shield will have a 100% proc chance.
(If Rubick steals this, he will obtain Echo Shield while the spell is active)
7/11/15 second duration
120 second cooldown (With Scepter, 60)