Izzet Chemister | Helm of the Host | Time Stretch

Cards

Time Stretch in hand.
Izzet Chemister and
Helm of the Host on the battlefield.
Helm of the Host attached to
Izzet Chemister.
({8} magic symbol) ({U} magic symbol) ({U} magic symbol) available the first turn, with ({1} magic symbol) ({R} magic symbol) each extra turn available.

Cast
Time Stretch by paying ({8} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take two extra turns after this one.
At the beginning of your combat phase,
Helm of the Host triggers, creating a token copy of
Izzet Chemister.
Activate the
Izzet Chemister token's first ability by paying ({R} magic symbol) and tapping it, exiling
Time Stretch from your graveyard.
On your next turn, activate the
Izzet Chemister token's last ability by paying ({1} magic symbol) ({R} magic symbol) , tapping it, and sacrificing it, casting the exiled spell without paying its mana cost.
Resolve that spell, causing you to take two extra turns after this one.
Repeat from step 2 (note that you may divide these steps among your multiple extra turns to reduce the mana requirements down to the amount shown in the prerequisites).