I love seeing an artifact deck build up a board state, and then just activate a bunch of abilities on someone's end step.

Also playing with something that changes the way the game functions like using a [[Leylines of Singularly]] to shut down tokens, forcing a game to close out with a [[forced fruition]], or equipping an opponent's creature with [[spy kit]] and hitting it with [[eradicate]] to exile their non legendary creatures from all zones.