Maralen, Fae Ascendant (Lorwyn Eclipsed)

Legendary Creature Ñ Elf Faerie Noble - Flying
Whenever Maralen or another Elf or Faerie you control enters, exile the top two cards of target opponent's library.
Once each turn, you may cast a spell with mana value less than or equal to the number of Elves and Faeries you control from among cards exiled with Maralen this turn without paying its mana cost.