Commit to Memory

Reveal {x} cards from your library and return
them in any order. Immediately before your next
draw phase, recall {x} cards as you reveal them
from your library individually.
If you fail, send all {x} cards to the graveyard.
If successful, choose 1 card to draw and cast
without paying its mana and/or sacrifice costs.
Shuffle any leftover cards into your library.
If you draw any cards before your next turn,
send this enchantment to the graveyard.