Not all of these have infect themselves: In fact, many dont
While it is most likely only a coincidence, a conspiracy theorist might claim some unlucky person at WotC or the printing company received the unenviable task of fishing thousands of Clefable cards out of stacks of cut cards as they were needed as prerelease promos
Additionally, Pikachu and Jigglypuff were printed in English on Japanese card stock on March 1, 1999, in the Hyper CoroCoro Spring Issue
I haven't researched either commander yet so I can't give a definite answer, but my gut reaction is that Sisay, Weatherlight Captain is probably stronger
Once your initial supply of hourglasses are gone, your supply of card packs slows down significantly to just 2 a day on average
On the plus side, moves can have multiple variations with enough creativity instead of just being one-note