It's all good.
You don't have to own the sets or the heroes to have a discussion on the Forum's.
It is what the forum's is all about.
A Good Skill/Set Combo I enjoy is the Provoke - Freeze Combo.
You have a hero who does a Provoke Move.
You equip the hero in a Frost Set.
(The Froze set has a chance to freeze the enemy hero when they attack the wearer of the Frost Set)
In my case, I own a hero named Maulie who has an AOE Provoke Skill.
I put my Maulie in a Frost set.
My Maulie will Provoke the enemy forcing them to attack her.
When the Enemy does Attack her, The Freeze Set can trigger causing the enemy to get Frozen.
By doing this combo, You can cause the enemy hero to be taken out of the fight 2 times in a sense.
I really enjoy the combo.
Another Good Skill/Set Combo I enjoy is the Block Revive - Destroy Combo.
You have a hero who does a Crazy Hard Hitting Block Revive Move.
You equip the hero in a Destroy Set.
(The Destroy Set reduces the Enemies Total Health by 40% of the Damage you do)
In my case, I own a hero named Fenax who has a Block Revive Skill.
I put my Fenax in a Destroy set.
My Fenax will do his hard hitting move.
The Goal would be for him to 1 shot the enemy making it so the enemy can't Revive the hero.
However, sometimes, you might not be able to 1 shot the enemy.
This is where the Destroy set comes into play.
If the enemy doesn't out right die, They will get their total health reduced which sets them up for a 1 shot on the next cycle of moves.
This is a very good combo to use against Stall teams in Arena.