sydderal

Not 3 copies, just twice the same champion and yes in hand. But to manage twice the same champion in hand well you need at least two of the same in your deck at start. And not that optimistic if …

Technically any deck having at least twice the same champion can outlast the four turns after the deck obliteration effect by playing the champion and the spell associated to it to shuffle one champion back in the deck indefinitly if …

You can even attack with Sejuani on the far left (first to attack) and if her attack conclude and deal dmg trought with overwhelm every other defending enemies will get frostbite, for this attack phase.

Counters already exist in different shape or form outside of Deny sometimes with lower cost and usage outside of spell play.

It doesn't counter burst.

It does have a niche to counter unit skills and untargeted + unconditional …