You may pay WUBRG 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 dies, shuffle it into its owner's library.
NM-Mint - $99.00
Lightly Played - $94.10
Moderately Played - $89.10
Heavily Played - $79.20
Damaged - $64.40
NM-Mint Non English - $99.00
Lightly Played Non English - $94.10
Moderately Played Non English - $89.10
Heavily Played Non English - $79.20
Damaged Non English - $64.40