tainted remedy vs lifelink
you are attacking your opponent who has the tainted remedy enchantment in play under their control [if an opponent would gain life, that player loses that much life instead]) say they have 3 life and you have 2--- you are attacking with a creature with lifelink and 3 power. now to gain life from your creature's lifelink it first has to do damage- so it does it';s damage to your opponent meaning their life becomes zero and they lose but since you also have to lose 3 life from tainted remedy, presumably at the exact same time, the game should end in draw. MTGA however paradoxically and incorrectly resolves the damage from the tainted remedy enchantment "first" so that the player attacking with the lifelink creature loses. even if the creature has the first strike ability, such a match should actually end in draw and i believe this is a bug.