Herath, The Osmopath

Flying, hexproof
Whenever an opponent reveals the top X cards
of their library, you may draw X cards, where X
is the amount of cards revealed this way. If you
do, you may put a permanent with a converted
mana cost of X into the battlefield. X is the
number of cards revealed this way.
"Allowing you to take your secret to the grave
would be such a waste"