While thats likely to let us take advantage of Kardur and Karazikars abilities, whats cool is that we can also just put the counter on one of our own creatures
The game tries to avert this with its special heroes (Legendary, Mythic, Ascended, Rearmed, etc.), which are intentionally made more powerful than regular units and are usually based on the endgame promoted versions of the characters in question
If they try to play Monsters in Defense Position, Red Dragon Archfiend can destroy them all by attacking once
Casual players have a great alternate win condition in Liliana's Contract, while Liliana's Defeat is an exceptional sideboard card in black-heavy metas
It's ability also means that, in combination with a powerful creature, Sylvan Safekeeper can help insulate key pieces from removal