Enchanted permanents you control can tap to produce at least .
You control at least one land that does not have a Settlement token attached to it, or enchanted permanents you control can tap to produce at least .
An opponent cannot block and kill Preston.
Steps
At the beginning of your combat phase, Preston's first ability triggers, putting a Settlement Aura token onto the battlefield attached to a land you control.
Declare Preston as an attacker.
Preston's second ability triggers, untapping each enchanted permanent you control.
Move to your postcombat main phase.
Activate any number of enchanted permanents you control by tapping them, adding at least .
Activate
Aggravated Assault by paying , untapping all creatures you control and causing you to get an additional combat and main phase after this one.
Repeat.
Results
Infinite combat phases.
Infinite mana creatures you control can produce.
Infinite untap of creatures you control.
Infinite untap of enchanted permanents you control.
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.