Merfolk Windrobber {U}
Creature — Merfolk Rogue
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.
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Cards that do something similar expected a card that isn't here?
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Eye Collector 95%
$0.18#10204
"Whenever this creature deals combat damage to a player, each player mills a card."
Reef Pirates 87%
$0.27#27132
"Whenever this creature deals damage to an opponent, that player mills a card."
Jerren, Corrupted Bishop // Ormendahl, the Corrupter 87%
$0.44#13420
"Sacrifice another creature: Draw a card."
Dina, Essence Brewer 84%
$3.35#7144
"Whenever you sacrifice a creature, draw a card. This ability triggers only once each turn."
Lena, Selfless Champion 82%
$0.39#8457
"Sacrifice this card: Creatures you control with power less than this card's power gain indestructible until end of turn."
Hope of Ghirapur 82%
$3.77#3223
"Sacrifice this card: Until your next turn, target player who was dealt combat damage by this card this turn can't cast noncreature spells."
+1 more matching line
Living Lectern 82%
$0.07#23501
"{1}, Sacrifice this creature: Draw a card. Create a Sorcerer Role token attached to up to one other target creature you control. Activate only as a sorcery."