Oza, Overseer Of Thought

Hexproof
Whenever Oza would enter your graveyard,
shuffle it into your library instead
Players cannot draw more than 1 card beyond the
first card they draw on each of their draw steps.
Oza is not a creature unless the average number
of cards in opponents hand is equal to 5 or more
Whenever Oza deals combat damage to a player,
that player discards that many cards