I know I had to correct you on this once before, but combo is the most casual deck type, not the least. You try taking Lionheart Maverick.dec to a tournament and see how it does.
Well, I think you got the best win-con for the deck. You could also add R mana and use Barbarian Ring. Threshold shouldn't be too bad when you can sac all your lands.
For more fun win-cons, Vinelasher Kudzu. Every iteration of the combo gives it a permanent boost. In the same vein, Seed the Land does some good things. Horn of Greed can give you a very large amount of draws. It is, however, mandatory, so you can't go infinite. Maybe Staff of Domination?
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He could also put in blue a single blue mana just so he could do a win con with Laboratory Maniac and Horn of Greed