Kotis, Sibsig Champion | Altar of Dementia | Scholar of the Ages

(and one other card)

Extra Turn Spell - GY on Resolution

You have enough mana available each turn to cast the extra turn spell and enough mana each extra turn to cast
Scholar of the Ages.
You have not cast a spell using
Kotis.

Cast the extra turn spell by paying its mana cost, causing you to take an extra turn after this one.
Move to your extra turn.
Activate
Altar of Dementia by sacrificing
Scholar of the Ages, causing you to mill cards equal to
Scholar of the Ages's power.
Cast
Scholar of the Ages from your graveyard by paying its mana cost and exiling three other cards from your graveyard, ensuring not to exile the extra turn spell.
When
Scholar of the Ages enters the battlefield, it triggers, returning the extra turn spell from your graveyard to your hand.
Repeat.