So, at school I play Commander with a constructed vampire-themed deck called Vampiric Bloodlust. The commander Edgar Markov's Eminince creates a 1/1 vampire token whenever you cast a Vampire keyword spell.
However, in that deck is a card called Fell the Mighty. Which removes all creatures with a higher power than a target creature.
So I spawn literally almost anything in the deck, generate a token, and pop Fell the Mighty on the token. Instant field wipe.

I have a number of decks constantly being taken a part and out back together. Currently I've been playing Mirri G/W Tokens and I'm currently rebuilding Monored Goblins.

The deck got even better when they printed Teferi, Time Raveler recently. I'm a fan of any deck that makes it so your opponent doesn't get to play Magic.

In the set that gets released next weekend, they printed a card that allows you to do some nutty things. Here's how it works.

1) Play Marauding Raptor. The important bit of text is that when a Creature enters the battlefield under your control the Raptor deals 2 damage to it. Sounds less than ideal, right? Why would you want to damage your own Creatures? Well...

2) Play Polyraptor. Relevant text is that Polyraptor makes a copy of itself when it takes damage. Do you see where this is going?

3) When Polyraptor enters the battlefield, Marauding Raptor deals two damage to it.

4) Polyraptor makes a new Polyraptor. This new Polyraptor enters the battlefield.

5) Return to step 3 for infinite Polyraptors

Unfortunately, this is a never ending loop. If neither player has a way of interacting with the loop (probably by killing one of the creatures involved), then the game ends in a draw. Remember, don't get so busy thinking about if you could make infinite dinosaurs that you forget to consider if you should.

-Phobos