Youll want to keep a close eye on what your opponent is playing, and respond as needed
Ruby/Sapphire decks normally have a good amount of removal (outright banishing characters) and ramp (adding extra ink in a turn)
Shared Animosity Shared Animosity is important as it makes all your Assassins much scarier to block, and makes it easier to drain your opponents' life
2 Blossoming Tortoise Another ramping powerhouse, Blossoming Tortoise mills three cards when it comes into play or when it attacks, returning a land from your graveyard to the battlefield tapped
And while, in theory, the more limited design space of stack interaction makes it challenging to balance counterspells against each other, in practice, I feel that almost every entry here is a viable inclusion for Commander or other formats where theyre legal not to mention a host of other counterspells that didnt make the Top 20