Ancient Adamantoise below zero and indestructable bug
Ancient Adamantoise can have toughness below zero and giving it indestructible will continue to allow it to live.
Normally of a creature's toughness goes to 0 or lower, it dies and this cannot be stopped by indestructible.
However in this case (see image) it is at -22 and is still able to survive. I'm not sure that is intended.
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Rezzahan#77802
commented
Damage does not reduce toughness, even if Arena shows it as a reduced toughness value. The Adamatoise clearly has taken damage, but not enough toughness reduction to make indestructible irrelevant. It's toughness is still above 0. Judging by your screenshot, you have not reduced its toughness by even a single point. You only dealt damage, and damage does not reduce toughness.