Each stun counter stops a creature from untapping for a turn, so if you put three stun counters on a card, it will remain tapped for three turns
This changes a bit in glacially slow Constructed metas, where games are expected to last until turn 10+ on average
If you have a commander that cares about assassins hitting your opponents, that deck is probably an assassin typal deck focused on getting in with assassins
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Boyd, "Eye of Myrkul," in Dungeon Adventures 73 (April 1999) Divine Contention (on D&D Beyond) Icingdeath, Frost Tyrant The nomads of Icewind Dale considered the white dragon Icingdeath to be but a legend, a tall tale to scare children
She's both an enabler and a payoff, giving her multiple roles in the deck