Cast Shard of the Nightbringer by paying ({5} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
When Shard of the Nightbringer enters the battlefield, it triggers, causing an opponent to lose their entire life total due to Bloodletter of Aclazotz and you to gain that much life.
The opponent loses the game due to having 0 or less life.