Triumph of Saint Katherine dies, triggering itself and
Verdant Succession.
Resolve the
Triumph of Saint Katherine trigger, exiling it and the top six cards of your library into a face-down pile, then shuffling that pile and putting it on top of your library.
Resolve the
Verdant Succession trigger, searching your library for
Triumph of Saint Katherine and putting it onto the battlefield.
Resolve the
Altar of Dementia ability from step 1, causing target player to mill cards equal to