Destroy Evil invalid target
I had a 5/4 creature targeted by opponents Destroy Evil. So I cast an instant spell to damage the creature so its toughness goes down to 3, making it 5/3. Destroy Evil still resolves to destroy the creature. This is a bug!
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Rezzahan#77802 commented
Damage does not reduce toughness. Instead damage gets marked on a creature until the cleanup step. Marked damage is compared to a creature's toughness, and if that marked damage equals or exceeds the creature's toughness it gets destroyed as a state based action. Arena shows marked damage as reduced toughness for ease of use, as there is already so much information that has to be displayed. So your damaged creature still was a 5/4 and a valid target for Destroy Evil.