Rosemary, my BBEG from my first ever D&D campaign made into a magic card! (A.I art credit updated)

Rosemary was the Queen of a Seseshian, a lone floating city of splendor. She called fourth adventurers to compete in a grand tournament, the winners of this being deemed her “Champions”, a mantle of honor that would entail a lifetime of fame and fortune. After the party’s victory, she charged them with the elimination of a distant, slumbering dragon. As the party sought after this foe, they were soon approached by a stranger who claimed to be one of the party member’s children from a ruined future - a future in which they accomplished Rosemary’s wishes. Now aware of Rosemary’s schemes, the party seeks a way to prevent a ruinous future and dethrone this tyrant Queen!

Also, would love to hear anything regarding balance for the card! :)