Joseph, Dream Interpreter

Whenever you draw a card, you may exile it. If
you do, put a dream counter on it.
{x}, Remove X dream counters from cards you
own in exile: Look at the top X cards of your
library. You may reveal a card with mana value X
or less from among them and put it into your
hand. Put the rest on the bottom of your library
in any order.
{1}{w}{u}, Sacrifice Joseph: Prevent all damage that would be dealt to you and permanents you control
this turn