Activate Woe Strider by sacrificing Sister Hospitaller.
When Sister Hospitaller dies, Body Launderer's first ability triggers, causing Body Launderer to connive.
Resolve the Woe Strider ability.
Activate Woe Strider by sacrificing Body Launderer.
When Body Launderer dies, its second ability triggers, returning Sister Hospitaller from your graveyard to the battlefield.
When Sister Hospitaller enters, it triggers, returning Body Launderer from your graveyard to the battlefield and causing you to gain 4 life.
Resolve the Woe Strider ability.
Repeat.
This elegant loop relies on an endless cycle of sacrifice and resurrection to generate massive value. Woe Strider acts as the engine, providing a reliable sacrifice outlet that constantly feeds the graveyard while Sister Hospitaller and Body Launderer trade places on the battlefield. Every time Sister Hospitaller is sacrificed and brought back by Body Launderer's death trigger, her entry ability resurrects Body Launderer in turn while padding your life total. Meanwhile, Body Launderer's connive trigger continuously filters your hand, drawing you deeper into your deck as the loop repeats indefinitely.