[fixed/closed]Sidewinder Sliver attacker lifegain

[Nexhro]

Describe the Bug:
When a Sliver creature attacks while its controller also controls Sidewinder Sliver, that player gains one life for each attacking Sliver after blockers have (or not) been declared.

When the AI also controlled a Sidewinder Sliver and blocked one of my Slivers with his Sidewinder and 2 other Slivers, it gained 1 life, so I'm unsure what the calculation behind this lifegain was.

Which card did behave improperly ?
Sidewinder Sliver

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
April 17 2014, duel

What exactly should be the correct behavior/interaction ?
Sidewinder Sliver doesn't make its controller gain life by itself in any way.

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

Fixed 80a1156.