The Well

Indestructible, protection from colorless.
When The Well enters the battlefield, choose up
to X nonland cards in any graveyard and/or on
the battlefield under any player's control.
Shuffle the chosen cards into a pile.
At the beginning of your draw step, instead of
drawing cards from your library, you may draw
the same amount of cards from the pile created
by The Well's effect.
If The Well leaves the battlefield, exile all cards
in the pile created by The Well's effect.