Mage + Summoner + Inferno
It's still super broken. I didn't even want to run it, the game just kinda gave it to me so I just went with it. Got a Mage's Cap on both my Zyra and my Annie, Deathcap on Zyra, she was dealing upwards of 6k every round. Seems that tier 3's come too easily too. I ended with T3 Veigar, T3 Vlad, T3 Zyra, T2 everyone else (Zed, Brand, Annie, Taliyah). My summons were tanky and they did an absolute ton of damage, Vlad was tough to kill (though I didn't get really good items on him, so he was a lot squishier than he could've been). Basically I quickly just became unstoppable.