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DomainDomainAbility word: scales with the number of basic land types among lands you control. — Creatures can't attack you unless their controller pays 
for each creature they control that's attacking you, where X is the number of basic land types among lands you control.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
