Mindless Automaton without a -1/-1 counter on it).
Steps
Activate
Ashnod's Altar by sacrificing
Mindless Automaton.
When
Mindless Automaton dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Repeat.
Notes
As mana allows, you can activate
Mindless Automaton's first ability assuming you have a card in hand to bring it back up to two +1/+1 counters. You can then remove those to draw a card, replacing
Ashnod's Altar in that iteration assuming there's no anthem effects boosting
Mindless Automaton's toughness.
Results
Infinite creature ETB.
Infinite creature LTB.
Infinite colorless mana.
Infinite death triggers.
Infinite creature sacrifice triggers.
Infinite draw triggers.
Infinite rummaging.
Infinite self-discard triggers.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.