Howlsquad Heavy by tapping it, adding for each Goblin you control.
Activate
Aggravated Assault by paying , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat.
Notes
Howlsquad Heavy creates a 1/1 Goblin creature token that will have haste during each combat phase, leading to infinite creature tokens with haste and ETB.
Results
Infinite creature ETB.
Infinite combat phases.
Infinite red mana.
Infinite creature tokens with haste.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.