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: Put a matrix counter on target creature and that creature gains "Remove a matrix counter from this creature: RegenerateRegenerateTap it, remove it from combat, and heal all damage on it. this creature." Activate only during your upkeep.
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.
