The current implementation of "Master of My Domain" is a little underpowered.
Why don't we allow a reroll on the 20% chance until that fails, incrementating the +1 counter on each successful pass thus creating a probability distribution function (feel free to critisize, I only vaguely know what I'm talking about).
Let's have an example; to try and illuminate what I'm trying to get across:
20% ^ 1 (= 0.200) -> +1 to attribute
20% ^ 2 (= 0.040) -> +2 to attribute
20% ^ 3 (= 0.008) -> +3 to attribute
. . .
Let's add in some additional animation when an afterburner event occurs. Like a swirling suction of energy inbound on the caster that then gets blasted back out (think Sauron's demise when the ring is cut from his finger). Maybe a booming voice (the voice of God himself perhaps - think Jim Carrey / Morgan Freeman from "Bruce Almighty".) saying "Afterburner!", then your character does a "I've got the power!" response. Maybe ZZ Top phase in and do that little thumbs up synchronized motion that we all know and love, then wave goodbye, lean dangerously to one side in unison before phasing back out.
While we're at it, let's rename the inscription to "After Burner", "Top Gun" or "The Cruise Effect".
s

