Zero point ballad did not destroy glacial godmaw.
I cast zero point ballad for x=6 on my second main phase after combat damage was assigned. Glacial godmaw had base toughness 6, and after damage had toughness of 1. Opponnent sacrificed three lander tokens to add +1/+1 three times until end of turn, so the glacial godmaw had modified toughness of 4. I don't understand why it didn't die from my zero point ballad. Attached log file of Edge of Eternities draft and match.
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bumblebacon#70291
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Rezzahan#77802
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Damage to creatures does not reduce toughness. The reduced value is simply an indicator ARENA uses to help remembering marked damage. The Godmaw's toughness, after 3 lander tokens got 3 more lands, was 9.