Well frankly I found this boss battle to be easy but others aren't so here is a small guide for it
First here is the deck I used:
First notice that I'm using Jewel of the Feint as well as a normal feint. These two cards are vital if you want this battle to be easy.
*note* when you cast a blade, shield, or trap Helios will place a hex on you, just make sure you have a shield up at anytime he has a lot of pips and the hexes aren't a big deal (use the 70% dual shield from ice)
Strategy: First if you are going second quit (esc->quit) then try again. You want to go first in this battle.
Once in battle shield until you have enough pips to one hit the minion and take the minion out. As with most bosses in cl Helios starts with a lot of pips so most of the damage will be dealt early on.
After the minion is dead and he has exhausted his begging pips use the basic buff and one hit judge tactic. Make sure that you have a shield up when you are casting feint as yes he uses firezillas.
That's it. Yes I make it sound a lot harder than it is, if you are prepared .
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