Casting so many spells may seem like a lot but youll quickly realize how easy it is if you take a look at the cards youre playing
However, its ability is that whenever an opponent loses life for the first time during each of their turns, Valgavoth, Harrower of Souls gains a +1/+1 counter, and you draw a card
Nevinyrral, Urborg Tyrants steep mana cost and conditional token generating effect makes it unlikely youll be casting it much ahead of the end game, but the sheer number of Zombie tokens it can produce is staggering, especially since it counts all creatures, tokens included
Another good addition is Guardian of Faith since its phasing out ability wont kill your tokens the way exiling and returning to the battlefield would
As always, let me know what you think of my rankings in the comments below or over on the Draftsim Twitter