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But, as time passed and all the original summoners died, the house passed into the hands of others

I see this not as a Combo piece in Commander but rather a great quality of life card for budget decks that also hose your opponent's better lands

Or so the name, Shimmering Skies, suggests

The first is an extra point of toughness that's a big difference on a 1-drop, since Ruin Crab can effectively block creatures with 2 power

Examples include mana dorks, mana rocks, and spells which allow you to put extra lands into play beyond the one-per-turn limit. The right ramp for you will depend entirely on your deck

You can see the Elven Empire precon's decklist here