ferra, the motherless pup

Companion—as long as Twilight, the Moonwolf
is your commander this card can be your
companion.(if this card is your chosen companion,
you may cast it once from outside the game).
Constellation—when an enchantment
enters the battlefield under your control, if your
commander is in the command zone, the
next time you cast your commander, it costs
{2} less to cast this turn.