Note that the worst squad in the larger game is not the same as the worst squad in a “worst squad” tournament.
Specifically, all the easy early wins will get filtered out of a “worst squad” tournament, so having answers to Upgrades/Heroes is much less important. Also, games will generally hit Tech II, and you are highly unlikely to have a way to gain advantage early.
As a result, the blue starter is actually quite strong, since it retains value through the mid to late game. Conversely, something like Balance isn’t as strong as it looks, since you don’t need the efficient answers. Conversely Law is much stronger than it is in the general population, since it’s higher powered but less efficient answers are going to be more effective.
I would pick [Balance]/Bashing/Future as the best combo to hand the opponent. You’re giving them only expensive heroes, no good non-starter spells, and no Haste. You know that you’ll either be facing Basilisks or Iron Men at Tech 1, and can plan accordingly. Bashing or Balance at Tech II are both reasonable, as are the Tech III options, but whatever you get should be able to compete.