Collectible Card Game Headquarters

Describe the Bug:
If a player has less life than the amount paid for X, the game won't prompt the choice windows for him (and won't be affected by the card effect)

Which card did behave improperly ?
Killing Wave

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/12/20: Commanding 2014 Urzas,duel

What exactly should be the correct behavior/interaction ?
If a player has less life than the amount paid for X, the game will still prompt the choice windows for him (and be affected by the card effect)

Are any other cards possibly affected by this bug ?
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I suspect the issue is the engine doesn't allow you to pay for negative life amount...

Fixed in d539773

Don't know if this is still bugged or a design choice, but with Duh mode turned off, AI and I both having 3 life and 1 creature and X=5, neither was given a choice and both creatures were sacrificed. Given that there are effects which prevent you from loosing the game, I'd think the choice would still be necessary.

There's no such problem: as per the rules, you can't pay the life you haven't.