Arthur, Lord of Frenzy

At the beginning of your upkeep, Choose a card
name that hasn't been chosen from among Golos, Chanel, Fastbound, Biorythm, Coalition of victory, and Flash. Create a copy of the card with
the chosen name. You may cast the copy. (You still pay its costs.)

Forecast—{0}, Reveal Arthur from your hand: Create a token copy of Mox Opal. (Activate only during your upkeep and only once each turn.)