There are many questions here, first who are you supposed to emblem ?
You’re saying you use Proteus everywhere ATM, so use your emblems on him. And overall you should use your emblems on heroes you use the most. No matter who is the heroe, if you use him almost everyday, it’s better to have him emblemed than let them sleep.
Once said, is Proteus deserves emblems ? I think almost everybody told you how good he is. Long story short:
- he freez mana
- decent attack base, relevant in a stack
But I don’t think he’s an emblemed owner for long term. Looking on every aspect of the game, he’s not a must in a titan team and you’ll find someone else who brings more in long terms.
If he’s relevant to support on rare quest and challenge quest at the begining, well as rare quest are easy you’ll not need him for long. On challenge he can help, but the goal here is speed and Proteus is not relevant to compet (meaning reloaded several boards until you can set your combos as quick as possible).
On raids, he will help you to progress at least he’s a good bet for platinium. But in high diamond it’s more a gamble. Main issues with prot are he is squeeshie and average.
You won’t freez fast heroes with lvl 30 mana troops before they are triggered, plus Proteus often dies before any use.
In general in high raids you want to bring heroes who makes sens regarding the opponant team. For instance you want to use Rigard when you’re facing a flanck or wing Gravemaker (well you want to use rigard anyway cause GM is everywhere…), the problem with proteus is you can’t bring him for a specific task: is not a counter and well if he’s still in my purple stack it’s because of his attack base.
He’s this kind of heroe who shines at a specific moment of the game but seeing his use decreasing on long term. In many aspects he’s the opposite of Merlin. Merlin is not really a good bet early on, but when you start to face heavily emblemed Mother North he counters her so hard that you want to keep him with you.
To summurize, use emblems on Proteus but plan to move them on in long terms.