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Well Acid Splash coming out in the next set does at least one point of automatic damage if a creature doesn't have any armor, Malacoda does automatic poison damage, Torment of Morlock can do autodamage to cursed creatures.
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I haven't checked spoilers for new cards coming out but, I was looking for damage out side of upkeep.
~ As to your specific example there is only a 1 in 243 chance of that happening, that sucks... foxes are wily critters though .~
Damn fox bit me for the last time
, so I thought. Long story short I was to be a victim of either convince(sweeping attack with a forcemage) or humor (was wining a game with a wizard and has some spell on a stick an thought hell why not). I don't remember which was the fox but, either way I was pissed [both times something was to die and didn't].
As for your dice math... (I DON'T WANT A WAR ON DICE MATH HERE
) just by glancing at it you not taking into account each dice had 2 "blank" sides. A .004 chance just seems too low for that. No matter that math it was very demoralizing.