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Making this much mana means that, on the turns when you arent gunning for a win, you can just sink all those extra resources straight into Thrasios and either ramp even harder for next turn or draw into threats for another win attempt
4 Krark The Thumbless And Sakashima Of A Thousand Faces Krark's flavour text says all you need to know about this deck
What they both do, however, is enable explosive turns, and thats whats important in casual EDH these days
While Wizards never printed the original Dual Lands again, they did print a number of similar land cycles
But you can make it better by including multicolor spells so that every individual spell gets multiple triggers