When Karmic Guide enters, it triggers, targeting Sister Hospitaller.
Holding priority, activate Woe Strider by sacrificing Karmic Guide.
Resolve the Karmic Guide ability, returning Sister Hospitaller from your graveyard to the battlefield.
When Sister Hospitaller enters, it triggers, targeting Karmic Guide.
Holding priority, activate Woe Strider by sacrificing Sister Hospitaller.
Resolve the Sister Hospitaller ability, returning Karmic Guide from your graveyard to the battlefield and causing you to gain 5 life.
Repeat from step 2.
This elegant recursion loop hinges on a continuous cycle of mutual resurrection between Karmic Guide and Sister Hospitaller, with Woe Strider acting as the sacrificial altar that keeps the engine moving. Whenever Karmic Guide enters the battlefield, its ability plucks Sister Hospitaller from your graveyard, while Sister Hospitaller neatly returns the favor upon her own arrival to constantly cycle both angels through the yard. Woe Strider not only fuels the loop by turning each sacrificed creature into scry depth and fodder, but also provides the initial Goat token to kick things off right when it hits the board.