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.
2
votes
WildfireDragonlord#30932
shared this idea
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Davin#69087
commented
Had the same issue, an opponent stacked multiple Unholy Annexes for free damage, healing, and draws without needing to fulfill the card's requirements. It's completely unbalanced with this bug in place.