Teysa, Orzhov Scion sacrificing one creature multiple times to exhile
The cost must be payed all at once.

The triggered ability that provides the Spirit token would not be placed on the stack, much less resolve, before you finish activating the ability. This happens the next time a player would get priority.

As such, you will not have a Spirit token to sacrifice before you finish activating the ability, which means you won't have a Spirit token to sacrifice to activate the ability, which means you are unable to activate the ability.