Tidespout Tyrant + Emet-Selch, Unsundered // Hades, Sorcerer of Eld + Time Stretch

Cast Time Stretch from your graveyard by paying .

Tidespout Tyrant triggers, returning Hades from the battlefield to your hand.

Resolve Time Stretch, causing you to take an extra turn after this one.

Move to your first extra turn.

Cast Emet-Selch by paying .

When Emet-Selch enters the battlefield, it triggers, causing you to loot.

Move to your second extra turn.

At the beginning of your upkeep, Emet-Selch triggers, transforming itself into Hades.

Repeat.