For completeness sake: The player cant choose an option thats illegal or impossible , with the exception that having a library with no cards in it doesnt make drawing a card an impossible action (see rule 120.3)
The Pokmon Company never published insert rates
Nicknamed "Skittles" Skithiryx can lead a mono-color Commander infect/poison counter deck
And last is Showstopping SurpriseShowstopping Surprise
In addition, if you understand the Japanese kanji characters theyre writing for both Arita and Sugimori, the difference in hand writing becomes clearer as well
(1) When your opponent activates a monster effect while you control a Therions monster: Activate 1 of these effects, OR, if you have Perpetual Engine Argyro System in your GY, you can activate both, in sequence