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Tax Keeper gets +X/+X, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander from your command zone twice, it gets +4/+4.)
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.
