Cavarus, Weeping Wizard

At the beginning of your upkeep, each player
puts the top card of his or her library into his or her graveyard. Then, search your library for a card that shares a card type with one of the cards put into the graveyard this way, reveal it, and put it into your hand. Then shuffle your library and put a -1/-1 counter on Cavarus.
Once he knew all, but now he weeps for what he has forgotten.