Sinistcha evolves from Poltchageist and has some incredibly useful abilities, like healing 30 damage from each of the player's Pokmon with its powerful "Matcha Splash" attack
Being able to phase something out as a protective measure is a useful, powerful effect worth having in your back pocket, especially in Commander
Oh, I can cast all my colorless/devoid cards off the top of my library
This at least shows that these cards are known and are in circulation to some degree, whether or not the Hasbro and the highly chased in Hungary claims are true
Starbirth is also a crazy ability, even though you can only use it once a game
Special Guest printings havent affected prices too much in the past, and only showing up in one in every 64 Play boosters, youre not going to see a lot of these