Played a 4 round legacy weekly last night and had positive experiences with both Oko and OUaT. Matchups were RUG Delver (Draw), Jeskai Mentor (Win), Naya Loam (Win), and 12 Post (ID). Oko was kill on site most games, but he did a ton of work stabilizing the board in the one game he stuck around against RUG Delver. OUaT doesn't do anything flashy, but it's a great new tool that helps smooth out draws.
For reference I'm on Sam Dams 60 card main deck with 2 Oko and 2 OUaT, which can be found here:
https://twitter.com/DutchOpenSeries/...610898433?s=19. Sideboard adjusted to accomodate the local meta.