Nyx's Feathers

Flying
Constellation— Whenever Nyx's Feathers or
another enchantment enters the battlefield under
your control, put a Phoenix creature from your graveyard to the battlefield.
If an enchantment would enter the battlefield
under your control while Nyx's Feathers is in
your graveyard, you may put Nyx's Feathers onto
the battlefield under your control. Nyx's Feathers entering the battlefield this way cannot trigger an ability.