This infinite loop transforms the humble Phyrexian Walker into a bottomless engine for death and sacrifice triggers, letting you scour your library clean with infinite scry 1 activations from Viscera Seer. The true genius of the combination lies in Leonardo, Sewer Samurai, which grants you the crucial permission to recast the Walker directly from your graveyard during your turn. Normally, that recursion would come with a heavy price by trapping the artifact creature under a finality counter, but Solemnity steps in to completely blank that restriction by preventing counters from ever being placed on creatures.