Commander decks with basic synergies

Just played against a friends insane “When you attack someone they fucking die” commander deck. It flew under the radar because he was just summoning weenies and gathering the kitchen knives, which is fair. But then after giving everything unblockable, granting them myriad, and chaining together combat steps, he just ran away with the game by stabbing everyone in the kidney.

I find it very hard to argue for threat assessment against a bunch of weenies, even when I know I’ll fucking die if they attack. So I’d like to know if there are other decks that operate like this, where some of the cards make other cards in the deck stronger. Just stuff in general that will 99% of the time not warrant a counterspell.