Keeper of Secrets

Flying
Adamant—If at least three blue mana was
spent to cast this spell, Keeper of Secrets enters the
battlefield with a +1+1 counter on it.
{t}{u}: Put the top 4 cards from the top of target opponent's library into their graveyard.
{t}{u}: Scry 1, then draw a card
"Some things are better left unknown."
-Chulane, Teller of Tales