mtg if you can't draw do you lose?

[tattletale]

If you cannot draw a card because library is empty do you lose?

[Arix]

Yes. But only when you would actually draw a card (ie, you don't lose just because you have an empty library, only when you actually have to draw from the empty library).

[kip]

you lose if you cant draw during your draw phase or if a card or ability tells you to draw but you dont have cards in library left