Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield on top of your library.
Activate up to two lands by tapping them, adding at least 2.
Activate Skullclamp's equip ability by paying 1, attaching it to Cloud of Faeries.
Cloud of Faeries dies as a state-based action due to having zero toughness.
Skullclamp triggers, causing you to draw two cards, including Sensei's Divining Top.
Cast Sensei's Divining Top by paying 1.
Teshar triggers, returning Cloud of Faeries from your graveyard to the battlefield.
When Cloud of Faeries enters the battlefield, it triggers, untapping the two mana-producing lands.
Repeat.
This clever loop turns Teshar, Ancestor's Apostle into an engine by treating historic spell casts as a revolving door for your graveyard. Every time you cast Sensei's Divining Top, Teshar triggers to bring back Cloud of Faeries, whose entrance untaps your lands to pay for the action while Skullclamp mercilessly converts the Faeries' zero toughness into fresh cards. Sensei's Divining Top then seamlessly cycles back into your hand or onto your library to keep the historic spell count climbing, ensuring you draw your entire deck in a flurry of feathers and steel.