Pyfo, Hypnotic Agent

Whenever Pyfo, Hypnotic Agent deals combat
damage to a player, exile that many cards from
the top of that player's library face down.
At the beginning of each end step, if you cast one
or more spells that you don't own this turn, exile
that many cards from the top of your library face
down.
You may look at and play cards exiled with Pyfo,
Hypnotic Agent.