Playtest cards were made by the games designers to experiment with rules and balance long before real printing began
Whether you're an MTG, PTCG, or another TCG enthusiast, maintaining a well-organized collection is a breeze.
Theres a difference of philosophy at play here, and if youre really into Ostracize or whatever discard spell you like, then by all means do your thing, but Im going to state my case for why Thoughtseize is totally fine for more Cubes than its considered for
However, Zareth San often works better in the 99 rather than as a commander, as his ninjutsu-like ability cannot trigger from the command zone
Within the MTG colors Blue, Red, and White, the possibilities of overwhelming your opponents are endless
Its well-known that Commander is a great format for players on a budget