On the competitive side, Gladion's Final Battle has seen play in off-meta Festival Lead decks where its effect of giving single-prize attackers an 80 damage bonus helps them trade favorably with bulkier threats like Dragapult ex
Creatures (14) Lands (22) Spells (23) 1 Fireball 4 Lightning Bolt 1 Hymn to Tourach 3 Necropotence 4 Dark Ritual 3 Drain Life 1 Black Vise 2 Shatter 3 Incinerate 1 Zuran Orb Sideboard Look, the mana wasnt great in those days
Yes, it was an incredible, powerful collection of spells, but why did it exist and for what purpose
However, as per WotC's comments in the Banned and Restricted post, the need to ban Up the Beanstalk also comes from current and potential future design issues with other cards
Although you can call it a precon upgrade, my build is more a precon remake than an upgrade so you can start from zero and buy singles