Lavaball Trap is more of a sideboard deal for people who do landfall or go fetch lands. Even after their 2 lands hit play it still costs 5 to play which u probably would have already burned away on a BB-Elf or something. Take them out or sideboard and mainboard something interesting like Awakening Zone and Banefire. Awakening Zone ~ Pops out Eldrazi Spawn tokens every turn ~ eventually u just sac enough of them to hit someone with a Banefire or even Earthquake (though Earthquake does damage to players as well as creatures)
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