Submission: Crater

Crater
Combat
Potence
play when the opposing minion is burned and sent to torpor with 0 blood and there is still outstanding damage to resolve. Choose another minion controlled by the same methuselah. That minion suffers the damage.
play when the opposing minion is burned and sent to torpor with 0 blood and there is still outstanding damage to resolve. Choose another minion controlled by the same methuselah. That minion's controller burns a pool per outstanding damage.

Compelling game need:

As the most pure combat discipline in the game, needs a way to increase the value of its combats. This card achieves it by giving value to overkill.

But really, I just want to play that:

Crypt
12x Beast

Library
4 Slam
4 Immortal Grapple
4 Crater
78 Increased Strength

Find a method of letting the other disciplines bleed or deal pool damage is a good thing IMO, provided it's flavorful and not OP. Crater has a decent idea going for it, but the wording is really unconventional. Is there any other card that uses the phrase: "outstanding damage to resolve?" It doesn't seem like it.

I understand that what you wanted to say is "the opposing minion is burned OR sent to torpor". The "outstanding damage" part also doesn't work, you should have used the "avoid destruction" or "heal" words.

For instance, this is my take:
Play after the opposing vampire is unable to burn blood to either heal or avoid destruction. Choose another vampire controlled by the opposing vampire's Mathuselah. That minion receives X damage, where X is the amount of blood the opposing vampire failed to burn.
As above, but instead of dealing damage to the chosen vampire, his or her controller burns X pool (up to 3).