Cause a 2/2 creature to enter the battlefield under your control, which enters as a 1/1.
Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the 1/1 creature.
Tormod triggers. Holding priority, activate Umbral Collar Zealot by sacrificing Sword of the Meek.
Resolve the Tormod trigger, creating a 2/2 Zombie creature token.
Repeat from step 2.
This elegant loop turns the graveyard into a bustling engine by weaponizing Tormod, the Desecrator's passive ability to turn every graveyard departure into a fresh 2/2 Zombie token. Whenever a Zombie enters as a 1/1, Sword of the Meek happily resurrects itself from the graveyard to equip that creature, but Umbral Collar Zealot immediately sacrifices the Sword back into the yard to surveil 1 and keep the loop primed. Because the Sword leaving the graveyard triggers Tormod anew, you can cycle this sequence indefinitely to churn out infinite tokens, sacrifices, and surveils.