This is a really good challenge.
It will test your wits and your ability to cope with the "worst" cards.
Of course there are many Common cards out there which aren't really bad.
You just need to find them and make a good ability mash-up/combo.
I guess you've got a point.
I think he has Sum Sam Cr and other cards that we haven't got...
Oh well, that's the beauty of it. Challenge yourselves!
If you manage to beat the "gods" of UR through sheer wit and strategy, then you'd feel like you've won more than the jackpot.