I chose mono-black Zombies because WotC has provided a ton of support for the Zombie creature type over the decades, including lots of reprints, so its pretty easy to pull together a solid deck without breaking the bank
Rather than pay mana, you can pitch any blue card from hand to counter a spell for free
Unfortunately it comes into play tapped, probably negating the biggest upside Reflecting Pool has
Wilds of Eldraine will see the return of a creature land cycle for the five enemy color pairs
Having a sacrifice outlet in your command zone is powerful enough, but getting death triggers and getting to double up on them can be strong as heck
On cast youre granted another turn, which, when combined with its inability to be countered and protection from all colours was more than enough to get it banned in the Commander format