Forbidden Crypt

It will replace itself being sent to the graveyard, and exile itself.

The second ability is a replacement effect, not a triggered ability. The card never gets to the graveyard.

The “if you can’t” in the first ability refers to putting the card in your hand, as well as being unable to choose a card. Thus, if you can’t choose a card during resolution, you lose the game.

If more than one card is being drawn due to a single effect, apply the replacement as if the cards were being drawn one at a time.