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Here’s how it works:
Play Mycosynth Wellspring, and you get to fetch a basic land card and put it into your hand. Then, cast Artillerize, sacrifice the Wellspring to deal 5 damage to a creature or player, and you can search for another basic land card.
This combo also works well with Sun Titan from core sets M11 and M12, shown above. When you cast or attack with Sun Titan, just recur the Mycosynth Wellspring back into play and fetch another basic land. Solemn Simulacrum also works in place of the Mycosynth Wellspring as a perfect sacrifice target for Artillerize.