Very simply, the more you Surveil, the bigger Mirko gets, and the larger creatures Mirko can reanimate
We cannot just increase the number of successes in the population for both Threats (element #3) and Answers (element #4) without taking from somewhere else
Comprised of Malefic Maud, Rancorous Ruth, and Irate Ida, these three pensioners ambush the Courier with rolling pins
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Since it's relatively easy to keep on the battlefield (it can be played and bounced repeatedly), it's excellent as a creature that provides consistent card draw (a convoke enabler), and it's nice that it can even act as a mana dork in a pinch
Just having Necroduality in play means double the zombies, double the enter the battlefield triggers, double the fun