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Describe the Bug:
Gore Vassal ability can't be used in non-regeneration manalink timing.But it's ability needs the regeneration shield as we did for Boon of Erebos,Necrobite, Butcher's Glee and others.

Which card did behave improperly ?
Gore Vassal

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/27: Eldritch Moon v2, SEALED

What exactly should be the correct behavior/interaction ?
Gore Vassal ability needs the regeneration shield so that can be used to damage also.

Are any other cards possibly affected by this bug ?
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Now in dev 778ccb5 version it crashes as soon as it is cast.fixed

Fixed the crash in commit e2b6efd0, gargaroz had already made it activate outside of regeneration but only for -1/-1 effect not as a regeneration shield.
Also has the annoying prompt for "regeneration effects" all the time.

Added regeneration shield in commit efeef5a3.