Viscera Seer + Protean Hulk + Disciple of the Vault + Lesser Masticore + Melira, Sylvok Outcast

Viscera Seer
Protean Hulk
Disciple of the Vault
Lesser Masticore
Melira, Sylvok Outcast

Requires
Protean Hulk on the battlefield. All other cards in library. You have a way to cause Protean Hulk to die.
Steps
  1. Kill Protean Hulk, activating its ability and placing Viscera Seer, Melira, Lesser Masticore, and Disciple of the Vault on the battlefield
  2. Sacrifice Lesser Masticore to Viscera Seer, triggering Disciple of the Vault's ability and causing an opponent to lose 1 life
  3. Lesser Masticore's persist ability activates, bringing it back to the battlefield without a -1/-1 counter due to Melira's ability
  4. Repeat
Results
Infinite ETB. Infinite death triggers. Infinite lifeloss for opponents. Infinite LTB.