Mantis riders know that their mounts don't owe them loyalty. Even a Mantis that has been broken in for years would devour it's rider if he ever loses it's concentration.
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MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
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FATE REFORGED 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
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