Approaching slowly with your head bowed to avoid looking her directly in the eye you sink to your knees, imploring her for just a sliver of her power.
Magic is a game of variance and nowhere is this more true than in the 100 card singleton format Commander, and tutors are one of the best ways to make your deck more consistent. Beseech the Queen is a tutor that allows you to search your library for any card and put it into your hand. The only downside is that the card you tutor for has to have a mana value of less than or equal to the number of lands you control.
The hybrid mana cost makes this card easier to cast as it removes the need for triple black mana, but the main advantage of Beseech the Queen is that the card going to hand also allows you to use the card immediately and prevents it from being milled away.
Beseech the Queen is a highly flexible card that could go in the majority of decks that run black, especially Queen Marchesa.