A little graveyard hate, a side of lifegain, and just a pinch of incidental damage (for taste)
Usually, building a Zombie deck requires hunting down dozens of singles, but Eternal Might gives you everything you need in a single box
Most people get confused and think this means you only mill 30 cards, because you copied Halimar Excavator 5x and there are only 6, but because all creatures enter the battlefield at the same time and "see" each other as Allies, the net effect is to mill 65x6 cards or 180
though shes classified as a Soldier and hes a knight, they can nonetheless play well together as their abilities are not class-exclusive
Plenty of rares and even uncommons outperform mythic rares in competitive play
And it actually might make Errant and Giada work, if anything can