Grisly Totem is a funky card, it's good, but funky. Not an autoinclude even in the relevant decks but an interesting pick still.
Buffing instances of skill blips is a flexible but intermittent bonus, sometimes you just don't have the relevant icon or cannot spare a particular card on tests, however it's unlikely that you cannot muster cards for skill tests at all for rounds on end. The trick is to have a good set of expendable cards and skill cards to go with a Grisly Totem. It's very much like Minh's ability except you need to draw, play and pay for it.
Skill cards, while not required with Grisly Totem, really make it shine. Getting 3 skill pips for a Perception, Manual Dexterity, Overpower or Guts is really cool, more meaningful though are the 1-pip cards that are flexible, you can play Rabbit's Foot alongside Grisly Totem and essentially use it like an Unexpected Courage, an interesting prospect if you also have access to Scavenging and routinely chase clues (it gets real good when you get Relic Hunter). Even more usefully though all the variety skill cards like Resourceful, Eureka!, Inspiring Presence, Quick Thinking and so on, all of these become MUCH more interesting and effective when you can treat their icons as 2's instead of 1's.
While characters tend to have skill cards all over the place in terms of , , and , and therefore might flexibly use the bonus on what's needed, characters tend to have an overabundance of cards and a strong inclination to chuck them at tests rather then play them, this means that a might have less flexible things to do with a Grisly Totem but they can often get more use from it, which is great because unlike dudes there is very little competition for the accessory slot.
When you do trigger the bonus, you often trigger it on top of some pretty clutch tests, a Guts versus a Rotting Remains, any play of Deduction or Vicious Blow, Stunning Blow, you get the picture, it's pretty good.
If you have lots of skill mechanics in your deck that's really when Grisly Totem becomes a priority. Silas Marsh and Minh Thi Phan should take note, they are the perennial "ALL THE SKILLS!" characters with 50% percent of their decks being skill cards, so should "Ashcan" Pete, Roland Banks and Joe Diamond, all of whom tend to bulk up on cool skill mechanics like Deduction, Vicious Blow, Eureka!, Resourceful and/or Inspiring Presence.