Orah, Skyclave Hierophant + Whisper, Blood Liturgist + Thornbite Staff
Other: Infinite blinking of most creatures and most creature cards in your graveyard, Infinite death triggers, Infinite ETB, Infinite LTB, Infinite sacrifice triggers, Infinite recursion of creature cards in your graveyard
Activate Whisper using its own ability by tapping it and sacrificing your two additional Cleric creatures.
Whisper's ability from Thornbite Staff triggers twice and Orah triggers twice, but one of Orah's triggers has no valid target.
Resolve one Whisper trigger, untapping Whisper.
Resolve Orah's trigger, returning the sacrificed Cleric with the lowest mana value from your graveyard to the battlefield.
Resolve Whisper's ability, returning the Cleric with the highest mana value from your graveyard to the battlefield.
Activate Whisper using its own ability by tapping it and sacrificing your two additional Cleric creatures.
Whisper's ability from Thornbite Staff triggers twice and Orah triggers twice.
Resolve one Whisper trigger, untapping Whisper.
Resolve both Orah triggers, returning two Cleric creatures from your graveyard to the battlefield.
Resolve Whisper's ability, returning any creature from your graveyard to the battlefield.
Repeat any number of times.
Once you have no non-Cleric creature cards in your graveyard, you may choose the same Cleric with both Orah triggers in step 7 to avoid running out of valid Whisper targets, or you may sacrifice a non-Cleric creature to Whisper.
Resolve all Whisper triggers from the Thornbite Staff ability, untapping Whisper any number of times.
Cards: Orah, Skyclave Hierophant, Whisper, Blood Liturgist, Thornbite Staff