If one of your opponents is playing Baral - they deserve to be iona'ed. But really, I have never seen a Baral deck be successful - there just isnt enough gas to counter all the relevant spells, so you pick on one player and they hate you and the other 2 players play one on one and no one has a good time.
Kinda get the feeling that Lier, Disciple of the Drowned would be better in the 99 than as a Commander otherwise he just sets himself up for graveyard hate too easily and Mono U unfortunately doesn't have a whole lot of tools to get around that other than shuffling cards from your graveyard into your library. That being said I can see him being a potential powerhouse in my Esika, God of the Tree EDH / Commander deck which I mainly use for The Prismatic Bridge to poop out Legendary Creatures and Planeswalkers because netting a passive Past in Flames ability without having to worry about spells getting countered seems too good to pass up IMO.
I feel like I'll get much better value out of Lier, Disciple of the Drowned more than Sakashima of a Thousand Faces due to how powerful Flashback is in EDH / Commander plus I have access to other colors instead of being pigeon holed to just Mono U If the graveyard protection is still warranted based on what my playgroup is playing. Lier, Disciple of the Drowned If cast early through Jeweled Lotus could ruin someone at the table from casting that Force of Will or Pact of Negation to stop another player from comboing off on turn 5 which I've seen happen when everyone doesn't discuss Rule 0 and throws too much caution to the wind with cEDH decks.
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