The goal isnt just to stop the opponent but to use their own heavy hitters to fund your winning play or a massive spell in your hand
Then destroy all other creatures if its power is exactly 20
It's strong everywhere, but it has enhanced value in archetypes that care about counters generally, +1/+1 counters specifically, proliferate tricks for multicolor brews looking to add loyalty counters for their planeswalkers, four and five-color decks, Commanders with evasion, Commanders with a power that, when increased by 1 get a faster kill, Equipment, Aura, and Voltron decks looking to get in kills with their Commander, and loads more
BLIGHTSTEEL COLOSSUS Blightsteel Colossus is a house of an infect card, as this 11/11 artifact creature is not only indestructible, but it also has Trample