Rebound is a neat mechanic that lets you exile the spell when it resolves and then lets you cast it again at the top of your next upkeep step for free
Eight mana is a ton, but all the usual enablers, from Ugin, the Ineffable, Foundry Inspector, Forsaken Monument, Karn, Legacy Reforged, and Ultima, Origin of Oblivion help get you to that point
Today, gaining tapping and gaining 5 or 6 life for each time in Commander it's not as strong with its 40-life start, and there aren't as many of these running around to abuse the table with 4 in each deck, and there's not the obvious Elf deck power for most multiplayer tables where you usually had one, and sometimes two
It plays well in well-established decks like Whirza, Lantern Control, and Affinity
She had razor-sharp focus
This means they cant quest and must attack the next turn