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Solosis is classified as a 1-Diamond card in the Crimson Blaze set

Also, this is a [Once Per Turn] effect, so if you activate this effect when a card is removed from their security stack upon the first check, you can't activate the effect again upon the next check

And speaking of that, Lets talk about Draft Ive been enjoying reviewing all the new mechanics introduced last year, but have intentionally avoided discussing those from Alchemy

If you do have him for turn one, its worth playing him because of his Detective classification

It multiplies your best token, scales with how much mana you put in, and then hands out indestructible to all your tokens until your next turn