Sacrifice Protean Hulk to Varolz's regenerate ability.
Protean Hulk's ability activates, placing Melira, Wingrattle Scarecrow, and Disciple of the Vault on the battlefield.
Sacrifice Wingrattle Scarecrow to Varolz's regenerate ability, triggering Disciple of the Vault's ability and causing an opponent to lose 1 life.
Wingrattle Scarecrow's persist ability activates, bringing it back to the battlefield without a -1/-1 counter due to Melira's ability.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite lifeloss

Infinite creature LTB

Varolz, the Scar-Striped

Protean Hulk

Disciple of the Vault

Wingrattle Scarecrow

Melira, Sylvok Outcast

Activate Triskelion's ability by removing a +1/+1 counter from it to deal 1 damage to itself.
Repeat step 1 an additional 2 times, killing Triskelion.
Scythe of the Wretched triggers, returning Triskelion to the battlefield with Scythe of the Wretched attached to it.
Disciple of the Vault triggers, losing target opponent 1 life.
Repeat.

Triskelion

Scythe of the Wretched

Activate Vazi by tapping it, causing an opponent to create at least one Treasure token.
The Treasure(s) enter the battlefield as a 0/0 creature and die as a state-based action due to having 0 toughness, triggering Intruder Alarm and Disciple of the Vault that many times.
Resolve all Intruder Alarm triggers, untapping all creatures.
Resolve all Disciple of the Vault triggers, causing an opponent to lose 1 life for each trigger.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures

Infinite creature ETB for target opponent

Infinite death triggers for target opponent

Infinite creature LTB for target opponent

Vazi, Keen Negotiator

March of the Machines

Intruder Alarm

Titania's Song

Combos with "Disciple of the Vault"