Its a versatile tool against decks lacking in-theme omni-negates, and early testing shows promise across multiple lists
Lich-Knights Conquest 5 is a bonkers mana value for asymmetric mass reanimation like this
Strategic players seek cards with high damage potential and unique attack capabilities
Rowan, Scion of War have its place in Commander, and Rowan, Scion of War pulls it off with aplomb, facilitating huge, potentially game-ending plays with ease
Finally, as the planeswalkers we chose, we have Geyadrone Dihada as well to give us health, Liliana, Dreadhorde General to create blockers or remove creatures and give us eventual card draw, and Teferi, Master of Time to recycle our hand, phase out problematic creatures and possibly give us 2 extra turns