
First strikeFirst strikeDeals combat damage before creatures without first strike., forestwalkforestwalkThis creature can't be blocked as long as defending player controls a Forest., vigilancevigilanceThis creature deals combat damage before creatures without first strike, it can't be blocked as long as defending player controls a Forest, and attacking doesn't cause this creature to tap. (This creature deals combat damage before creatures without first strike, it can't be blocked as long as defending player controls a Forest, and attacking doesn't cause this creature to tap.)
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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.