Frankly, we're already pretty spoiled
Lightning, Army of One Lightning, Army of One hits quite hard, and it has interesting political potential as the damage doubling isnt restricted to your damage sources
As amazing as Gisela is, I have trouble imagining competitive decks bothering with Bruna, but that's fine: That pair serves Timmy and casual formats
Meanwhile, back in 2005, there was no card more broken than Umezawa's Jitte, with the equipment dominating the battlefield in harshly punishing decks that were built around small creatures, which is why it remains banned in Modern to this day
Meanwhile, those Steel cards in the deck are doing what Steel cards do best: They're taking up space on the battlefield with powerful attack and defense, while boosting each other