Merfolk Windrobber
From Zendikar Rising set
Merfolk Windrobber
Creature — Merfolk Rogue
1/1
Flying
Whenever this creature deals combat damage to a player, that player mills a card. (They put the top card of their library into their graveyard.)
Sacrifice this creature: Draw a card. Activate only if an opponent has eight or more cards in their graveyard.