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Players may respond to that ability knowing the value of X

Let's look at some examples: This card has no Condition or Cost

If this card, Special Summoned by the effect of a "Number" Xyz Monster, is destroyed: You can Special Summon other "Stealth Kragen" monsters from your GY, up to the number of materials this card had, then you can attach up to 1 WATER monster from your GY to each of those Special Summoned monsters as material

Additionally, Salamence does look like he could fair pretty well in the game

Starting with Theros: Beyond Death in January 2020, Wizards started putting cards from these Commander sets in the main set's Collector or Set boosters