It's crazy that the gregor one could have literally gone on forever without activating coin power up. That 50% chance would need 198 skills on AVERAGE to get to max, you always amaze me in your persistence Kully.
a defensive skill has to be left at the bottom untouched for the skill slot to bug out. with 2 or more skill slots, you can use an ego to self corrode. Just make sure the turn cancels before the corrosion ego plays out.