Oath of Ashiok

When Oath of Ashiok enters the battlefield,
search your library for up to four cards, exile
them then shuffle your library. Draw a card.
Spells and abilities that make players discard or
exile cards from their hand, library or graveyard
can't be countered.
Until the last the last of my memories are consumed.
Until my very last glimpse into the abyss, I'll keep
watch, or will I?