Cast Peer into the Abyss by paying ({4} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) , targeting an opponent whose library size is larger than their life total.
Resolve Peer into the Abyss, causing that opponent to draw cards equal to half their library size and causing them to lose half their life total, rounded up.
Nekusar triggers, causing the opponent to lose 1 life for each card drawn this way.
The opponent loses the game due to having zero or less life.