Timeblast Blessing

Timeblast Blessing gets +5/+5 and has vigilance
during extra turns.
Tap five other untapped Unicorns you control:
Take an extra turn after this one. Those creatures
don't untap during their controller's next untap
step. Activate this ability only on non-extra turns.
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Some herds of unicorns, called 'blessings', were
granted immense power by The Everdusk.