Cast Peer into the Abyss by paying ({4} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) , causing you to draw cards equal to half your library size and lose half your life total, rounding up each time.
During your cleanup step, discard to your maximum hand size.
Feast of Sanity triggers for each card discarded this way.
Resolve the first Feast of Sanity trigger, dealing 1 damage to any target and causing you to gain 1 life.