Raeni, The Warden

Whenever a creature card is put into a graveyard
from anywhere, you may have Raeni, The Warden
deal 1 damage to target player. If you do, that
player puts the top card of his or her library into
the graveyard.
{2}{u}{b}: Put the top card of your library into the graveyard. Target opponent puts the top card of
his or her library into their graveyard
"Crossing House Dimir is as good as a death sentence."