Forum:Endless Decay; fixed ATK or scaled?

Okay so I got myself the Prophecy Destroyer tin, mostly because I love the artwork, and it comes with some nice limited edition cards. One of these is Endless Decay, who ATK is set at half your opponent's life points. What I'd like to clarify is whether this only happens when the card is summoned, or if its ATK decreases with an opponent's life points. For example, if I summon it while my opponent has 8,000 life points, it will have 4,000 ATK, if I then attack their life points directly they will be reduced to 4,000; does Endless Decay still have 4,000 ATK, or is it reduced to 2,000? -- Haravikk (talk • contribs) 13:38, December 6, 2013 (UTC)