Unholy Annex and Mutavault
I think there's a bug with both Unholy Annex and Mutavault in play at the same time. Unholy Annex draws a card and deals 2 damage to opponent if there's a demon in play. Mutavault is a land that "CAN" become a creature of all types which may be what triggers the loss of life. However, the land isn't a creature unless activated and certainly not during my turn.
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BrandNeu42#30932
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