We had 18-month, rolling rotation, some sets being two years and others being less than a year, the end of small sets, the death and return of Core Sets, plus more Standard bannings in the last three years than anything since Urzas Saga Standard
Additionally, Lighting, Army of One has Lifelink, Trample, First Strike, and Staggering, which cause other damaging effects to double against an opponent or their permanents for one turn after she attacks
Youre playing against a black deck filled with Doom Blades and Obliterating Bolts, while you dont have a single creature on the battlefield
Then you can swing through any defense for a damage, making this good at defensive decks as well as Voltron decks looking to kill in the red zone with equipment and auras like Rancor