@Azagthor @Bakura
Thanks for suggestions, guys!

I was finally able to complete it using:
Alexander - Valors
Warrior LoL (10*) - Prime, Tranq, Guardian
Beelzebub - Thorn, Energy
Charlotte - Dominance, Warlord, Cosmic

You see, I was away from the game for about half a year so I don't have most of the talis you mentioned. From the newer sets the only ones I have are:
Forge (using them for insanity right now)
Alchemy (same as above)
Yin / Yang (same)
Artifact (these seem kinda useless to me especially since they boost Magic and they are of the Overwhelming subtype, haven't even powered them up)
Lantern (haven't used them yet as well)
and some new yellow 3-set from this event, don't remember the name

So I had to experiment with what I got and the above team actually worked. Honestly, I never thought I would use Beelzebub for any serious battle but I have to say he's great since he got buffed. That power move removes beneficials including golden ones (almost all of them) and the fury gives Vanish and Golden Hit so helps the team survive. Even his basic attack is useful because of a high chance of Perfect Death.
So - it may not be the best or fastest team out there but it worked for me. Certainly enough to complete the 15 required battles.

Again, thanks for help!