Territorial Aetherkite 


Creature — Cat Dragon
Flying, haste
When this creature enters, you get {E}{E} (two energy counters). Then you may pay one or more {E}. When you do, this creature deals that much damage to each other creature.
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Cards that do something similar expected a card that isn't here?
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Amped Raptor 98%
$0.18#7368
"When this creature enters, you get {E}{E} . Then if you cast it from your hand, exile cards from the top of your library until you exile a nonland card. You may cast that card by paying an amount of {E} equal to its mana value rather than paying its mana cost."