Chancellor of the Mulligan [Unknown Event]

You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, shuffle it into your library and draw a card.

Menace

When Chancellor of the Mulligan enters the battlefield, draw three cards. When you do, any number of target players mulligan. (They shuffle their card into their library, then draw that many cards and put one of them on the bottom of their library.)