Moongrum, Carian Knight

Flash.
When Moongrum, Carian Knight enters,
Mill 3. Then, you may exile an instant or sorcery spell with converted mana cost of 4 or
less from your graveyard. You may cast the exiled card without paying it's mana cost until
end of turn.
It's loyalty to the Lunar Queen never waned,
despite the decline of the royal family.