Ob Nixilis, the Hate-Twisted | Peer into the Abyss

Cards

Peer into the Abyss in hand.
Ob Nixilis on the battlefield.
Target player has cards in library equal to or greater than their life total.
({4} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) available.

With
Ob Nixilis, the Hate-Twisted on the battlefield, cast
Peer into the Abyss targeting an opponent.
Peer into the Abyss would resolve (with card draw and life loss rounded up in instances of odd number of cards or life), and then the static ability on
Ob Nixilis, the Hate-Twisted dealing damage for each card drawn.