Although Permission does exist as a deck archetype, you cant win the game by countering spells
Each turn, you can cycle a card, get a free spell from your deck thanks to Unpredictable Cyclone, use Astral Drift to flicker Eternal Witness, and then, when Eternal Witness comes back into play at the end of the turn, you can get the cycler back from the graveyard so you can cycle it again during your opponent's turn to get another free Unpredictable Cyclone card
double blocking a Favored Hoplite then casting Stomp on another one of their creatures, allowing you to kill the Hoplite in combat
Deconstruction I've used relatively simple examples thus far, but let's take the plunge and show you a very cool card with a lot of information about it and deconstruct what we've learned today
Dread Return Dread Return is a 4-mana sorcery that reanimates a single creature from your graveyard
I have killed many people out of nowhere who were casting a simple mass damage effect for just creatures, like activating a Silklash Spider for 10 or something