Anowon, the Ruin Thief

Other Rogues you control get +1/+1.
Whenever one or more Rogues you control deal
combat damage to a player, that player mills a
card for each 1 damage dealt to them. If the
player mills at least one creature card this way,
draw a card.
(To mill a card, a player puts the top card of their
library into their graveyard.)