Exchange of Words + Scute Swarm + Mutavault

Prerequisites

You have a land card in hand. You control at least five lands.

Steps

1. Activate Mutavault's first ability by tapping it, adding {C}.
2. Activate Mutavault's second ability by paying {1}, causing it to become a 2/2 creature that is still a land until end of turn.
3. Cast Exchange of Words by paying {1}{U}{U}, exchanging the text boxes of Mutavault and Scute Swarm.
4. Play a land.
5. The land enters the battlefield, triggering Mutavault's Scute Swarm ability, creating a copy of Mutavault with its original text.
6. Step 5 repeats in a mandatory loop unless interrupted, drawing the game.