It grows bigger with each spell you cast, pings every opponent, and then turns into a colossal amount of mana ready to cast yet more spells
Dragons of Tarkir gave us five newcomers (Dragonlord Silumgar, Dragonlord Atarka, etc.), Core Set 2019 gave us retrains of the originals (Arcades, the Strategist, Nicol Bolas, the Ravager), Strixhaven added five more as the namesakes of the different schools (Tanazir Quandrix, Beledros Witherbloom, etc.), and the five metal dragons from Baldur's Gate were also given the double creature type (Ancient Bronze Dragon, Ancient Copper Dragon, etc.)
When you swing through the air, you spend some mana and sweep all nonland permanents with that casting cost
The effect to mill and return Rat creatures is great as well
The artists penchant for capturing light and dynamic composition is fully realized in Ajani Steadfast, his very first Planeswalker, and began a long tradition of excellence we still see growing today