Cast Walk the Aeons with buyback by paying ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) and sacrificing three Islands, causing you to take an extra turn after this one and return Walk the Aeons to your hand.
Declare Zethi as an attacker.
Zethi's second ability triggers, causing you to pay ({2} magic symbol) ({W} magic symbol) ({W} magic symbol) to cast a copy of Sudden Salvation.
Resolve the copy of Sudden Salvation, returning the three Islands that were sacrificed from your graveyard to the battlefield.