If the target of Fear of Lost Teeth's ability is an illegal target as the ability tries to resolve, it won't resolve and none of its effects will happen
Mai, Scornful Striker This is just an elegant design, and something were familiar with on comps like Eidolon of the Great Revel
Illustrated by Mateus Manhanini Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Both of these things lead to far more non-creature cards being played in most archetypes
Some cards also just dont fit, like Growth Spasm and Kessig Cagebreakers which have no meaningful reason to be in the deck
Getting to cast Channel in Commander is a hell of a drug, and thankfully its gated behind a three drop that then needs you to have a power seven or greater creature, and then have that three drop (and you!) survive a full turn cycle