altanek damage error
I blocked Altanek, a 9/9 with trample, with a 3/5 and a 6/5. My opponent had no abilities or spells to boost Altanek; and it did not have death touch. After damage was dealt, both of my creatures were dead. This cost me the game. Magic doesn’t work if math doesn’t work. Someone fudged up a rounding error. I checked every single card on the battlefield and in the graveyard to make sure I didn’t miss anything.
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Rezzahan#77802 commented
If the toughness of one of your creatures was depending in some way on the other (counting number of creatures, getting a p/t boost, etc.), then killing that other creature with combat damage will also reduce the first creature's toughness, enough to kill it as well. Damage stays marked on creatures until the cleanup step unless it gets removed earlier by an effect (regeneration, totem armor).