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You may pay 
rather than pay this spell's mana cost. If you do, X is 5.
Bringer of Green Zenith's Twilight enters the battlefield with X +1/+1 counters on it. If X was 5 or greater, it enters with twice that many counters instead.
When Bringer of Green Zenith's Twilight diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., shuffle it into its owner's library.
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.
