Creature didn't die
Widows Bite didn't work on a creature with stolen Stark Tech. After damage was resolved and the toughness of a creature was reduced to 2. Stark Tech was attached to another creature and I used Widows Bite on that creature, the creature didn't die. Lost the Game. This happend in a premier draft.
poak#77215
shared this idea
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Rezzahan#77802
commented
And there is nothing wrong here.
Damage does not reduce toughness, it gets marked on a creature and stays until it is removed in the cleanup step, or an effect like regeneration removes it. Marked damage gets compared to the creature's toughness to determine if it is lethal. Stolen Stark Tech gave the creature indestructible until the end of the turn, so until the cleanup step. Thus reducing the toughness to a value still higher than 0 was lethal but couldn't destroy the creature since it was indestructible. You did not reduce the toughness to 0 or less, which is required to invoke a different state based action to kill the creature, which does not involve destroying it, and would get around indestructible.
Arena displayes marked damage as reduced toughness but with a claw mark over it. That is marked damage, not reduced toughness.