({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) available the first turn, with ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) each extra turn available.
Steps
Cast Walk the Aeons by paying ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one.
Activate Izzet Chemister's first ability by paying ({R} magic symbol) and tapping it, exiling Walk the Aeons from your graveyard.
Move to your next turn.
Activate Izzet Chemister's second ability by paying ({1} magic symbol) ({R} magic symbol) , tapping and sacrificing it, casting Walk the Aeons from exile without paying its mana cost.
Resolve Walk the Aeons, causing you to take an extra turn after this one.
Cast Izzet Chemister from your graveyard by paying ({2} magic symbol) ({R} magic symbol) .