Activate Emmara by tapping it.
Emmara triggers, creating a 1/1 Soldier creature token.
The Soldier enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Resolve the Emmara ability from step 1, causing you to surveil.
Repeat.

Infinite creature tokens

Infinite creature ETB

Infinite mana creatures you control can produce

Infinite self-mill

Infinite surveil

Infinite untap of creatures

Tocasia, Dig Site Mentor

Intruder Alarm

Emmara, Soul of the Accord

Activate Stonybrook Schoolmaster by tapping it.
Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard creature token.
The Merfolk Wizard enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Resolve the Stonybrook Schoolmaster ability from step 1, causing you to surveil.
Repeat.

Stonybrook Schoolmaster

Activate Warchanter Skald by tapping it.
Warchanter Skald triggers, creating a 2/1 Dwarf Berserker creature token.
The Dwarf Berserker enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Resolve the Warchanter Skald ability from step 1, causing you to surveil.
Repeat.

Warchanter Skald

Activate a creature by tapping it, causing you to surveil 1.
Denzilore triggers, putting a +1/+1 counter on each creature you control.
Herd Baloth triggers, creating a creature token.
Repeat.

Combos with "Tocasia, Dig Site Mentor"