At this point most players will start wondering, "What do they have to stop what I'm planning?" Abeyance takes away all that worry, while greatly increasing the chance of victory during an attack (or defense) by preventing the opponent from playing "instants, interrupts, sorceries, or abilities requiring an activation cost"
Not only that, but I can pay one black mana to give it haste until the end of turn, and I can pay two black to regenerate it
With each mythic rare planeswalker having a rare, an uncommon, and a common reference, we knew we had a great match for the showcase cards in the set
This gives it a ton of range, as it finds ramp (Jukai Naturalist, Sanctum Weaver), card draw (Sythis, Harvest's Hand, Enchantress's Presence) and pillow fort cards (Ghostly Prison)
Winning the lottery