They will force certain bad plays
4 Minn, Wily Illusionist Draws Extra Cards & Pumps All Illusions 4,591 Decks on EDHrec.com Blue decks nearly always find ways to cash in on extra card draw, and in Minn, Wily Illusionist's case, that payoff is making a board full of Illusion creature tokens
It does a weak impression of Kira, it can't really be killed, it draws cards while applying pressure, and its base stats are quite pushed for a Merfolk which will reliably be getting pumped by lords
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So Charlotte Katakuri can set himself and Charlotte Linlin as Active, allowing you to attack with Charlotte Katakuri and still have him as a blocker to protect your Leader
not like you would if piloting a deck with counterspells, for example