({3} magic symbol) ({U} magic symbol) ({R} magic symbol) if Ashling Command is in your hand, or ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) if it's in your graveyard, plus an additional ({4} magic symbol) in colored mana that is at least three different colors available.
Steps
If
Ashling's Command is in your graveyard, activate
Horde of Notions by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) , causing you to cast
Ashling's Command from your graveyard without paying its mana cost. Otherwise, cast