I'm not sure I'm communicating this right. I thought I would have five chances to kill Tempomaster on my last turn. First attack hits, 9 total damage done, cumulative 0% chance Tempomaster is dead. Second attack hits, 10 total damage done, roll 1 in 10 chance tempomaster dies cumulative 10% chance Tempomaster is dead. Third attack hits, 11 total damage done, roll 2 in 11 chance Tempomaster dies, cumulative 26.36% chance Tempomaster is dead. Fourth attack hits, 12 total damage done, roll 3 in 12 chance Tempomaster dies, cumulative 44.77% chance Tempomaster is dead. Fifth attack hits, 13 total damage, roll 4 in 13 chance Tempomaster dies, cumulative 61.77% chance Tempomaster is dead. Sixth attack hits, total damage taken is 14, roll 5 in 14 chance Tempomaster dies, cumulative 75.42% chance Tempomaster is dead
The equivalent of a 75% chance to kill Tempomaster is a 30 out of 40 roll, or starting from 8 damage a single 32 damage attack. Even if most of the equivalent damage is "healed" at the end of the turn, that's still far too powerful. If you only rolled to see if Tempomaster died once, then my card did not work as intended, but I won't use that effect again, so it doesn't matter too much.