It wouldn't really help, you fundamentally can't beat Ultimate Infestation with a control deck. Cubelock can win these matchups because they can go aggro with Doomguards, but pure control can't. Priest presents the same problem as you have to beat three Mind Controls. (one off Archivist) That's easier than beating UI which is why spiteful Priest is only a very bad matchup while spiteful Druid is hopeless.
Three mind controls? Archivist consumes the card.
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