Vahnzavier, Cosmo's Lightning

Whenever you lose life due to a source you don't control, draw that many cards.
Whenever a turn ends, discard your hand.
You don't lose the game if you would draw a card
and there are no cards in your library.
If you would lose life from drawing a card,
instead, counter that spell or ability and draw a
card. Effects countered this way can't be cast, activated, or triggered until the next turn.