Based on the fact that anyone can do it, I believe snipe combined with cloak is the actual culprit - it's possibly the easiest build to play ever and can have exceptional results.
But... I went for wings because it's stupid strong and some or the defensive arguments people have to it like "it's expensive" etc; just don't fly in my opinion, not for what wings do.
Maybe I'm just soggy that they took reflect away from Templar Bubble, removed double reflecting (strategic, at least for Templar) and took pre-cleanse away from Templars Ritual.
vMSA - Magplar - Xbox EU - 15/11/16
578,000 - 36 Minutes 58 Seconds (Top 2 World?)
vMSA - Magplar - Xbox NA
569,000 - 40 minutes (350CP, Non optimised runs)
I actually don't think anything on this list is overpowered.
I saw someone mention Permafrost. While I think Permafrost may be a tad annoying, I find it to be easily countered by a single AoE healing Ultimate like Remembrance (Templar) or Soul Siphon (Nightblade). It seems reasonable to defend from an offensive ultimate with a defensive ultimate.