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These provide your quanta. Combined with your mark of earth, they give you a good, and relatively stable, balance.
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Protects important permanents. Weather they target your pendulums, your sanctuaries, or your shields, you got it covered.
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Great protection from most creature and weapon attacks.
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Destroys enemy pillars and pendulums to slow them down.
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Use your relatively abundant earth quanta to increase your maximum HP, which goes well with the next 3 cards.
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Provides creature control and additional healing.
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Provides healing and protects your hand and quanta pool as long as you have one of them active.
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A monster heal that works especially well with your Stone Skin, but it takes a lot of light quanta.
Other options:
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Provides a small amount of damage and scrambles their quanta. It was either this or miracle for the last slot, but I chose miracle because I wouldn't need to worry about protecting it.