Learn Commander Strategy Commander Brackets 1-5 Explained Understand the bracket system, what each bracket means, and how Game Changers push your deck higher
Giving only your Slivers flying is a departure from the usual flair of Slivers giving all creatures that share the type an ability, but it does make it the best way to give your Sliver creatures evasion
That said, custom cards will always benefit from sleeve protection during active play same as any collectible card you'd rather not wear down
He might have gotten a better price selling them on Yahoo Japan Auction but at least he got his deposit money back.
By using the effect of Speedroid Colonel Clackers to place Speedroid Wing Synchron in your Pendulum Zone, then following up with its effect, you can play the Level 2 Speedroid Colonel Clackers (as a Tuner) plus Clear Wing Synchro Dragon
It could end up being a good thing