Limitless Knowledge

Draw three cards.
Whenever a card is put into your hand from anywhere, you may reveal it. If it has converted
mana cost 4 or greater, return Limitless
Knowledge from your graveyard to your hand.
Upgrade {2}{b}{b} ({2}{b}{b}, Discard this card: Search
your library for a card with converted mana cost equal
to this card's converted mana cost plus 1 and put it in
your hand. Then shuffle your library.)