So, I'm pondering something for one of my NPCs and I wanted to put out my math and thinking to groupthink and see if anyone had some addition perspective/points of view to add. I think this can all be accomplished within the rules now, I'm just assigning it a 0 refresh cost to "codify it" as a special FX for the NPC.
How the Refresh works out:
(2) Worldwalker <- existing, prerequisite
(2) Inhuman Speed <- existing, prerequisite
(0) BAMF! <- new, I set the cost at zero because the character already has at least 4 refresh sunk into powers to pull this off. I figure that's more than enough considering 4 Refresh could grant a character spellcasting.
BAMF! (...or "Phasing" if you don't want Marvel to get grumpy) (0 Refresh)
Description: You have learned to combine your more-than-mortal speed with your mastery of the Nevernever to confuse and bewilder opponents.
Notes: A character must already possess both World Walker plus a Speed Related Power (Inhuman, Supernatural, or Mythic)
Skills Affected: Lore
Effects:
Blinking: Your character may enter the Nevernever as a Supplemental Action, move a distance up to whatever the character's Speed power grants minus 1 zone (thus, Casual Movement allows Blinking within the same zone, Effortless Movement is up to 1 zone away, Instant Movement is up to 2 zones away), and then potentially reappear in the same Exchange.
The character rolls Lore and requires at least a Good (+3) to accomplish this (the +2 Lore granted by Worldwalker's Strange Worlds applies to this roll) in a single Exchange. Failure to get at least a Good result means that the Nevernever in this area has an unexpectedly complex structure and the character fails to reappear in this Exchange (especially crafty or evil GMs can even turn this into a mini-scene before allowing the character to reappear). For each 3 shifts over and above the requisite 3, a non-sticky Maneuver Aspect can be applied to the scene (Suddenly Flanked, Surprise!, etc. etc.).
For clarity: Blinking itself is a full Action (the movement elements and going in-and-out of the Nevernever are Free and Supplemental Actions) thus the character cannot take an Action afterwards.