Lo Aena, Nightmare Crafter

When Lo Aena, Nightmare Crafter enters the battlefield, create a legendary 3/3 black
Nightmare creature token named Syla, Witch's
Familiar.
As long as you control a creature named Syla,
Witch's Familiar, Lo Aena and Nightmares you
control have flying and hexproof.
When Lo Aena dies, destroy each Nightmare you control.