Acid-Spewer Dragon {5}{B}
Creature — Dragon
Flying, deathtouch
Megamorph {5}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control.
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Cards that do something similar expected a card that isn't here?
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Belltoll Dragon 100%
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"When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control."
+1 more matching line
Herdchaser Dragon 100%
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"When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control."
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Shieldhide Dragon 100%
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"When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control."
+1 more matching line
Stormwing Dragon 100%
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"When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control."
+1 more matching line