Stalwart Successor | Ashnod's Altar

Cards

All permanents on the battlefield (
Puppeteer Clique without a -1/-1 counter on it).

Activate
Ashnod's Altar by sacrificing
Puppeteer Clique.
When
Puppeteer Clique dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When
Puppeteer Clique enters, it and
Stalwart Successor trigger.
Resolve the
Puppeteer Clique trigger, putting a creature from an opponent's graveyard onto the battlefield under your control.
Resolve the
Stalwart Successor trigger, putting a +1/+1 counter on
Puppeteer Clique.
Repeat.

Infinite ETB.
Infinite LTB.
Infinite colorless mana.
Infinite death triggers.
Infinite sacrifice triggers.
Put all creature cards from each opponent's graveyard onto the battlefield under your control.

This combo has been estimated to be Exhibition (Bracket 1+).