Atraxa looks like a solid +1/+1 commander with some of the best commander colors avaible and really good stats, BUT there's no efficient combo with Atraxa who could win the game against 3 opponents nor does she provide you card advantage, where Zirda, the Dawnwaker for example is already one part of a efficient combo (Zirda + Basalt Monolith/Grim Monolith + a card like Walking Ballista), which makes it pretty easy to win fast with her as a commander
Its a clever twist on ninjutsu, and Yuffie is a perfect fit for red-based aggro decks that care about artifacts and stealing them
Three underperforming items and actions in the Amber-Amethyst Starter Deck Dinglehopper Part of Your World Hakuna Matata Three underperforming items and actions in the Emerald-Ruby Starter Deck Stampede Steal from the Rich Hes Got a Sword
Honorable Mentions: Gisela, Blade of Goldnight While technically not a double striker, Gisela, Blade of Goldnight deals damage in double thanks to its own ability, and it also extends its ability to all your other damage sources
A 2/7 for 5 with an excellent flying hate ability like this seems really fair and on rate
Sound like a Read the Bones with a solid creature attached