I don’t have the Sincerest mythic Phoenicia but even if I did I wouldn’t be using it with this class, which is hilarious. You would think that if your hero is playing a Stryx you would want the Stryx mythic on your team. Wrong. Phoenicia does double damage only if there is a firestorm, but there is no way to (easily) get a firestorm because the Stormcaller’s third trait summons a Lightstorm at the begining of each turn. Garuda can summon a firestorm, but it’s absolutely useless because it only lasts for the opponent’s turn, then it’s back to Lightstorm.
You could run Doomed Crossbow which summons a firestorm and can get you the 4+ matches with skulls so you can cast Phoenicia’s ability after, but it’s also a red weapon so you lose out on that 5 magic from not having a yellow weapon along with yellow synergy.
You can also run Chaos Storm talent and hope you get a firestorm off a match… seems pretty silly though.