The Milling Runner is a rare Legendary Creature — Cat Gamer card from Unknown Event (UNK), collector number RZ03f.
Islandwalk, swampwalk (This creature can't be blocked if defending player controls an Island or a Swamp) Whenever The Milling Runner deals combat damage to a player, target player mills three cards. Ready to run (You can have two commanders if both have ready to run.)