What's the point of Arid Mesa and Marsh Flats when the rest of the deck is pure White? Really no need for a fetch card, especially ones that allow you to look for land that's not even in your deck.
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Goblin Piker? There's plenty of 2/1 goblins for 1R that have decent abilities like Goblin Shortcutter, Grotag Siege-Runner, and Slavering Nulls. Hell, Goblin Guide is even better. Get those Pikers out, man.