Devourer of Memory

Whenever one or more cards are put into your graveyard from your library, Devourer of
Memory gets +1/+1 until the end of turn and
can't be blocked this turn.
{1}{u}{b}: Put top card of your library into your graveyard.

"As you get older three things happen. First your memory goes, and I can't remember the other two."
— Norman Wisdom