You control up to seven lands that can tap to produce at least .
You control a creature with power 7 or greater that does not have summoning sickness, and that cannot be blocked and killed by an opponent.
Steps
Declare any creature with power 7 or greater that cannot be blocked and killed by an opponent and
Hellkite Charger if it isn't the aforementioned creature as attackers.
Shriekwood Devourer and
Hellkite Charger trigger.
Resolve the
Shriekwood Devourer trigger, untapping at least seven lands.
Holding priority, activate up to seven lands by tapping them, adding at least .
Resolve the
Hellkite Charger trigger, causing you to pay to untap all attacking creatures you control and causing you to get an additional combat phase after this one.
Repeat.
Results
Infinite creature ETB.
Infinite combat phases.
Infinite mana lands you control can produce.
Infinite untap of lands 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.