While the Worldsire doesn't have trample or any other form of evasion, it should be large enough that you can kill anything that crosses its path, and the land ability should be what you're using this for, with things like Valakut, the Molten Pinnacle or Field of the Dead
Here are a handful of those damage doublers, be mindful of any that offer increases to opponent's sources of damage as well: Angrath's Marauders, Twinflame Tyrant, Fiery Emancipation, Fiendish Duo, City on Fire, and Fated Firepower
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Its relatively easy to trigger and can allow for some nasty interactions
Still, Reid Duke did win GP Portland in 2014 playing 19 lands, so I wouldnt discount the option entirely
The ability that defines Duelist of the Mind's power works in all zones, not just the battlefield