Nashi, Searcher in the Dark (Duskmourn: House of Horror)

Legendary Creature — Rat Ninja Wizard - Menace
Whenever Nashi deals combat damage to a player, you mill that many cards. You may put any number of legendary and/or enchantment cards from among them into your hand. If you put no cards into your hand this way, put a +1/+1 counter on Nashi.