[fixed/closed]Essence Backlash deal damage according cmc

[Aswan jaguar]

Describe the Bug:
Essence Backlash doesn't deal damage according to creatures power but according to it's converted mana cost.

Which card did behave improperly ?
Essence Backlash

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/9/9: Conspiracy for the recoding of M15,duel

What exactly should be the correct behavior/interaction ?
Essence Backlash deals damage according to creatures power.

rulings to take into account as card is tricky:
Rulings
10/1/2012 Essence Backlash can target a creature spell that can't be countered. If Essence Backlash resolves, it won't counter the spell but it will still deal damage.
10/1/2012 If the creature's power is * and it has an ability defining its power, use that ability to determine its power.
10/1/2012 Abilities that change the power of a creature (such as the one of Collective Blessing) affect only creatures on the battlefield. They won't change a creature spell's power on the stack.

Are any other cards possibly affected by this bug ?
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[Gargaroz]

Here's another case of me completely misreading a rules text
Fixed in 7b90a72

[BAgate]

Can't test as it can't be cast.

[Gargaroz]

Fixed in bd74203