Smoldering Egg 

Creature - Dragon Egg
Power/Toughness:
0/4Artist:
Simon DominicShare:
Text:
DefenderWhenever you cast an instant or sorcery spell, put a number of ember counters on Smoldering Egg equal to the amount of mana spent to cast that spell. Then if Smoldering Egg has seven or more ember counters on it, remove them and transform Smoldering Egg.
Rulings:
No rulings foundLegality:
Sets:
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Magic Online Promos #94012 (rare)
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Innistrad: Midnight Hunt #159 (rare)
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Innistrad: Midnight Hunt Promos #159s (rare)
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Innistrad: Double Feature #159 (rare)
Other languages:
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Smoldering Egg