A played one will run you around $800 to $900 based on condition
While this alone already makes it a solid tech option, its [Trigger] effect firmly secures its valuereducing 1 of your opponents characters or Leader by 3000 power for a turn
Right now the deck is a touch low on X Mana threats, so adding another one that can draw cards feels like a natural move, though if you prefer Walking Ballista for tossing direct damage it's totally acceptable (or add both!)
two Entomb and/or Faithless Looting, and two Reanimate, as that means you can still combo through a piece of disruption irrespective of what they choose to hit
The first is a zero loyalty counter ability to proliferate, adding one loyalty counter up on all your planeswalkers any time any of them use this ability
Special Summon it, also you cannot Special Summon monsters for the rest of this turn, except Zombie monsters