Whenever Hellkite Charger attacks, you may pay 5RR. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.
Illus. Jaime Jones
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MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
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KHANS OF TARKIR 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
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