Creature — Dragon Egg // Creature — Dragon
Creature — Dragon Egg
Defender
Whenever you cast an instant or sorcery spell, put a number of ember counters on this creature equal to the amount of mana spent to cast that spell. Then if this creature has seven or more ember counters on it, remove them and transform this creature.
Creature — Dragon
Flying
Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target.
This triggers when the spell is cast, before it resolves. Even if the spell is countered, the cast trigger still resolves. Copies of spells are not cast, so they won't trigger this.