Being able to stack your hand with your best equip options and then boost all your creatures as a side-effect of stacking them on Kellen makes this card an auto-include for any red/white deck with an equip focus
A Future Sight in the command zone is a powerful ability that generates tons of card draw, even one as limited as this
Simic gold options are about as mind-numbing as Boros, with the difference being that players are more likely to play blue and green together without the specific draw of any gold card
It makes two Black mana when sacrificing recurring things like Bloodghast and Reassembling Skeleton
Mabel inspires the Mice around her, giving them +1/+1 as a passive bonus, while also creating the Cragflame, a legendary equipment token that gives a creature +1/+1, vigilance, trample, and haste
Edge of Eternities isnt just about grand cosmic conflicts