Nulldrifter is obviously a take on Mulldrifter, and tacking annihilator onto it is a way to hammer home the Eldrazi nature of it
As a bonus, ability, as if this card needs it, you can tap it and sacrifice ten nonland permanent to make all your opponents lose 10 life
and living weapon mechanic: on ETB, the equipment creates a 1/1 token and then auto-attaches itself to said token
She greatly helps you get where you need to be, she is a fine early play and she scales very well into the late game
Cheap Zombie threats that can then be turned into fuel for card draw and decay Zombie tokens make Wilhelt a persistent threat, one that needs to be addressed early in a Commander game lest things get out of control
The huge mana value can be reduced with all your removal and draw spells that keep you in the game