Collectible Card Game Headquarters

Describe the Bug:
I understand this is an approximation but I want to at least report this particular interaction since I have not seen it before.

If you have a card like Platinum Angel (or Phyrexian Unlife) in play and have already been reduced to less than 1 life, cards that set your life total to a specific number will not work correctly (such as Form of the Dragon or Magister Sphinx).

If Platinum Angel thinks you are at -2 life (despite displaying +1 life), Magister Sphinx will set you to +8 life instead of +10 life.

I know I know its an approximation, and it actually works correctly with normal healing effects.

Which card did behave improperly ?
The set life effect probably can't correctly calculate how much life to give you due to the angel effect. It seems to be simply adding 10 (in the case of Magister Sphinx) instead of accounting for the negatives that the angel tracks.

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
BNG v2 Feb 2014

What exactly should be the correct behavior/interaction ?
It would be nice if the life was set to the correct amount

Are any other cards possibly affected by this bug ?
A bunch.

.A variant of the known problem with Phyrexian Unlife plus an earlier Platinum Angel or similar effect (and a much harder-to-stumble-across one involving Leeches). There's no easy way to find out what your real current life total is; Platinum Angel and friends alter it much too late to take them into account.

Have been mulling over ways to get the real actual unhacked-with current life totals to display properly over on the left for a while, or alternately to suppress game loss when at or below zero life instead of making these cards artificially raise it to 1. This will fix itself in the latter case, or be much easier to fix in the former.