In Littens case, Fake Out can cause a Paralysis condition if you flip a coin and get heads
It's an especially good feeling when you can defeat your opponents with cards from their own deck, and the flavor of doing so in a Pirate based deck is difficult to pass up
On the other hand, people who strongly support the substitute technique tend to focus on the instances in which this works well (dual lands) and gloss over the fact that some of the Reserved List cards most important to the Commander format (Wheel of Fortune and Gaea's Cradle) don't have substitutes that are anywhere close to their original
However, none of those figures has four or more legs, so Llanowar Elves is not a valid target for Jermane's abilities
I hope you enjoyed this look into my opinions on the new Kaldheim Commander products
A copy of a spell goes on the stack after the original, so it resolves first