Saprazzen City

Whenever a creature comes in to play, look at the
top three cards of your library, you may reveal a
card with converted mana cost less than or equal
to that creature's converted mana cost, if you do
put that card in to your hand. Put all cards not
revealed this way on the bottom of your library
in any order.
"I visited the Saprazzen once, they are far
more advanced than we know."
-Yggdris, the Wise Elder