LogFAQs > #896481642

Well you guys are all making the card slightly stronger than it was as printed since you can choose to stop fighting, which I think might actually make it too good for its cost.

I think the most true to effect would be something like

Bunch of Punches (uncommon)
Sorcery
1RG
Target creature you control fights target creature an opponent controls.

Swan Song (As you cast this spell, put a copy of it targeting your creature for each distinct secondary target or choice on this spell. If your creature dies this turn, exile all of these copies.)

That may not be the most clean way for it to work but I think it's closest to the intended effect without having weird wording-- though the exiling copies mechanic is probably "too complicated" I think it reads better. Personally if I were to make it, since I like my Swan Song mechanic but that doesn't quite fit my vision, I'd probably do something like this:

Bunch of Punches (Rare)
Sorcery
1RG
Target creature you control loses indestructible until end of turn and fights a random creature an opponent controls. If no creatures received damage as a result of this spell, exert the creatures instead.

Swan Song (After this spell resolves, copy it targeting the same creature. Repeat this process until the creature dies or is exerted.)

Which again isn't necessarily the cleanest thing and I'm not sure you were able to use "exert" as per the design challenge rules but I think it's potentially a cool mechanic. Then again if I made this mechanic I probably wouldn't do it with this card to begin with, but you know.
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No problem!
This is a cute and pop genocide of love!