can't tell if sated diana is broken or just cheesy, but she is very fun right now
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with an elixir you still end up with enough AP to play like an assassin, except you have enough sustain and DPS to kill anything with basic attacks (literally, anything, soloing baron takes maybe 30 seconds as a burst caster ). unless I'm against teams with a lot of cc, 1v2ing and 1v3ing becomes a viable strategy, so long as I don't end up wasting my ultimate.
it probably sounds silly, and i'm not exactly the most qualified player, but her lategame feels equal to or perhaps better than sated jax
if nothing else, it is at least fun, and you should try it