With these, one in four of the arts contains the image of a monster stalking the character in the picture, with that monster absent the other three out of four times
When it comes to protecting your board, few cards do the job as well as this one (though unlike Teferi's Protection, it gives no such security to your life total)
It resolves even if that spell is countered or otherwise leaves the stack
But naturally, players will also want to know what the crystal cards actually do, and while there's always a chance of the rules changing before going to launch, these concepts seem pretty set in stone
But still, the salt is something to keep in mind and anticipate, so you're left with two options: 1) avoid Poison if your playgroup gets salty about it or 2) embrace the salt, play Poison anyway
Since I was working with packages of four to five cards, for example KCS plus Toxin, two Sewer-Velliance Cam plus Makeshift Munitions plus interaction, or four Galvanic Blasts, I focused on organizing the sideboard into small groups of four to five cards, and tried to avoid boarding more than that