Cauldron Familiar by sacrificing a Food, returning it from your graveyard to the battlefield.
When
Cauldron Familiar enters the battlefield, it and Samwise triggers.
Resolve the
Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain one life.
Resolve the Samwise trigger, creating a Food token.
Repeat.
Notes
If you have a way to kill
Evereth and ({1} magic symbol) ({BR} magic symbol) available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite lifegain.
Infinite lifegain triggers.
Infinite lifeloss.
Infinite damage.
Metadata
In 8 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).