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Haldir enters with X +1/+1 counters on it.
VigilanceVigilanceAttacking doesn't cause this creature to tap.
: Until end of turn, other Elves you control gain vigilancevigilanceAttacking doesn't cause this creature to tap. and get +1/+1 for each +1/+1 counter on Haldir.
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.