Sometimes this is done during the upkeep, or in response to card draw, in case your opponent draws a split second card (say, Krosan Grip for your Icy Manipulator), countermagic, or an untargetability effect, but in general it's best to wait until the last moment
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Why This Box is Perfect for You: Ideal for Commander nightscarry your deck in style
Thus, an ideal home for Hall of Gemstone is in mono-green Commander decks
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Still, if youre trying to keep your deck ahead in a competitive sense, youll want a good balance of mana sources, card draw, and synergy