Rampaging Aetherhood 

Creature — Snake Hydra
$0.29 #8572 0.16 1.6 years
Trample, ward 
At the beginning of your upkeep, you get an amount of
(energy counters) equal to this creature's power. Then you may pay one or more
. If you do, put that many +1/+1 counters on this creature.
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Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"At the beginning of combat on your turn, you may pay 

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"Pay 

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"

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"At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power."
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$0.15↓#12929↓0.00↓9.6 years↑
"When this creature enters, you get an amount of
equal to the greatest power among creatures you control."
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"Whenever this creature attacks, you may pay 
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"Whenever this creature attacks, you may pay 

. If you do, put a +1/+1 counter on it."
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"At the beginning of combat on your turn, you may pay 

. If you do, put a +1/+1 counter on each creature you control."
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$0.05↓#26004↓0.229.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
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"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
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$0.05↓#27283↓0.27↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Turtle75%
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"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
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"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."