See Challenge # 147, incorporating "Target Eight"

Each upkeep? I better make sure I have a designated driver lined up...

Well, you both have a 50/50 chance, so you may want to choose small drinks. I didn't think this was printable enough to develop :)

Blah, blah, blah legal drinking age varies by country :p

Oh, sure, you can choose a small drink if you're playing this card. But the controller of the enchantment has to choose her/his target drink before clashing. And I can assure you, if I'm in control of this enchantment, I'm only going to start targeting small drinks if I lose too many times in a row.

(Alternatively, I hope you like Moxie. Because I love the stuff, even though most people seem to hate it. And I brought a 12 pack with me, to boot.)

Another aside: On average, I would say that, with two decks of the same composition, that any one random player wins clashes maybe 37% of the time. You know, because of ties, and the reasonable chance that both players draw a land. If that's the case, then your chance of 'losing' a clash is 63%, with a reasonable chance of both players needing to drink. :)

Yes, I realise this only works in the UK and other 18 drinking age countries, and wizards would really choose USA if they had to choose a single country Un cards worked in. But that wouldn't have fulfilled the challenge :)

And yes, I don't know if it can ever be properly balanced. Maybe it should give the opponent the choice of drink, so they're implicitly buying in, and can choose water if they want, and you've already consented by putting it in your deck and casting it. And maybe say "if one player wins, the other..." because you're right, only one player should drink.

Hm, is there anything else that might actually be acceptable for un sets, but technically 18+?

;)