Pardon me if I don't do this correctly, this is my first submission.
Gravity Field
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Element - Gravity
Cost - 5G
Type - Permanent/Shield
The first creature that attacks you gains gravity pull if opponent controls no creatures with Gravity Pull.
Boson Field
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Element - Gravity
Cost - 7G
Type - Permanent/Shield
The first creature that attacks you gains gravity pull if opponent controls no creatures with Gravity Pull. If Boson Field is destroyed/stolen gain 3 Gravity Pillars.
Feedback welcome.