Erin Crystalia, Midnight Raven

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, you draw a card. (To mill a card, a player puts the top card of their library into their graveyard.)