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 or
Hellkite Charger.
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 and
Hellkite Charger as attackers.
Preston's second ability and
Hellkite Charger trigger.
Resolve the Preston trigger, untapping each enchanted permanent you control.
Activate any number of enchanted permanents you control by tapping them, adding at least .
Resolve the
Hellkite Charger trigger, causing you to pay to untap all attacking creatures and to get an additional combat phase after this one.
Repeat.
Results
Infinite combat phases.
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.