DJ BRI's Sonic Surge

When DJ BRI's Sonic Surge enters the battlefield, create a 2/2 blue and red Elemental Musician creature token named DJ BRI with "{T}: Add {U} or {R}. Spend this mana only to cast instant or sorcery spells."
At the beginning of your upkeep, you may reveal the top card of your library. If it's an instant or sorcery card, you may cast it without paying its mana cost. If you don't, DJ BRI's Sonic Surge deals 2 damage to you.
Whenever you cast an instant or sorcery spell, DJ BRI's Sonic Surge deals damag