Solemnity + Luminous Broodmoth + Sidisi, Undead Vizier

Solemnity

Luminous Broodmoth

Sidisi, Undead Vizier

How it works

1. Cast Sidisi by paying 3.
2. When Sidisi enters, its exploit ability triggers, causing you to sacrifice it.
3. When Sidisi dies, Luminous Broodmoth and Sidisi's second ability trigger.
4. Resolve the Sidisi trigger, causing you to search your library for a card and put it into your hand.
5. Resolve the Luminous Broodmoth trigger, returning Sidisi from your graveyard to the battlefield without a flying counter on it due to Solemnity.
6. Repeat from step 2.