You control up to seven lands that can tap to produce at least ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) .
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
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Hellkite Charger if it isn't the aforementioned creature as attackers.
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Shriekwood Devourer and
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Hellkite Charger trigger.
Resolve the
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Shriekwood Devourer trigger, untapping at least seven lands.
Holding priority, activate up to seven lands by tapping them, adding at least ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Resolve the
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Hellkite Charger trigger, causing you to pay ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) to untap all attacking creatures you control and causing you to get an additional combat phase after this one.