Maralen, Fae Ascendant [Lorwyn Eclipsed]

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.