Cast Lore Drakkis for its Mutate cost by paying ({U} magic symbol) ({U} magic symbol) , targeting Phyrexian Walker.
Lore Drakkis's mutate ability triggers, causing you to return Snap from your graveyard to your hand.
Cast Snap by paying ({1} magic symbol) ({U} magic symbol) , returning the mutated creature that contains the nontoken Lore Drakkis from the battlefield to your hand and untapping two Islands.
Cast Phyrexian Walker by paying ({0} magic symbol) .