Reject Imperfection does not work
I am playing Lier, Disciple of the Drowned deck now.
In past several games after casting several spell from graveyard, my Reject Imperfection fails to counter a spell (failed for Burn Down the House and for one -1/-1 proliferate instance. When casting my Reject Imperfection it asks whether I am sure to cast it over the target spell as if it had ward. And then the counter does not occur, however the proliferate works.
In other cases
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esosia#51500 commented
A bit of advice from a fellow player: Lier's first ability reads "Spells can't be countered". That includes spells your opponents control, It's not a bug; Arena was actually trying to warn you from wasting a counterspell on a spell made uncounterable by your own Lier.
As they say, "reading the card explains the card"...Last standard rotation had Divide by Zero banned exactly for its interaction with Lier. Returning a spell to hand doesn't count as "countering" a spell, and playing against Lier resulted in an unfun play experience where first you would be tempoed out of the game, and then you would be tempoed out of the game again as Lier flashed back Divide by Zero while Hullbreaker Horror bounced all of your permanents, only to get bounced back again by the next Divide By Zero flashback, with the Learn triggers either filling the graveyard or tutoring silver bullet Lessons from the sideboard...