Looking at all 5 lists that have placed top 8 in the last few weeks, seems like Faithless Looting (albeit as a singleton) is staking its claim as a staple just like in GDS. I've been trying it again in my jund list, but I don't know if I'd run it in 4C just because I hate being pulled in too many directions with color.
I've been living the new mulligan rule on MTGO. Been toying with a more combo oriented list but not quite all-in like Shadow Zoo.
Keeping in my Tron, Affinity, and Dredge - since those seem to be the decks on the rise due to the mulligan change. I like how it feels against Tron, haven't played the other two yet. Won two matches against Phoenix also