Zodiark, Umbral God did not die after reaching 0 toughness from a minus/minus abilty
Playing draft against Zodiark, Umbral God and put him to zero toughness using a minus/minus spell and he did not die. This directly caused me to loose the game. I would like a refund in a free draft token given the price of the draft.

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Rezzahan#77802 commented
In your screenshot Zodiak clearly has taken damage, and is covered by a protective effect, likely indestructibility. So you tried to combine damage with toughness reduction to kill an indestructible creature. That does not work. Arena displays marked damage on a creature by showing a redcued toughness to make it easier to see, how much more damage is needed to destroy the creature. But damage does not reduce toughness. So the Zodiark still has positive toughness, is indestructible, and has taken lethal damage. Therefore it lives. To kill an indestructible creature you have to reduce its toughness to 0 or less in its entirety with actual toughness reducing effects.
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Darkapollo#20726 commented
picture to go with it