Oh Crap I Sumonded Demon Wrong

Flying, trample
At the beginning of your upkeep, choose a
creature at random. Sacrifice that creature.
(yes, even if it's an opponent's creature.)
At the beginning of your upkeep, roll a d6 twice.
Oh Crap I Sumonded Demon Wrong gets -X/-Y,
where X is the first result and Y is the second.
"oh no i did it wrong now its all messed up oh no"
—You, I guess