Nao, Hero of Magic

Whenever another nontoken creature enters the
battlefield under your control, create a Treasure
token.
{t}, Sacrifice X Treasures: Target opponent
reveals the top X cards of their library. You may
put a nonland permanent card with mana value
X or less from among them onto the battlefield
under your control. That player puts the rest on
the bottom of their library in a random order.
"Now, if you'll excuse me, I really need to get back
to my thesis."