Kelris, Rylinvir Liaison

When Kelris, Rylinvir Liaison enters the battlefield, search your library for a legendary creature card and put it in your hand. Then,
shuffle your library.
Whenever a legendary creature enters the battlefield under your control, Shake Down
target opponent. (They may discard a card or sacrifice a nonland permanent. If they don't, they lose
1 life, you gain 1 life, and you draw a card.)