Squirrel Nest + Intruder Alarm + Nissa, Worldwaker

Squirrel Nest

Intruder Alarm

Nissa, Worldwaker

How it works

1. Animate the land that has Squirrel Nest attached using Nissa, Worldwaker.
2. Activate the land with Squirrel Nest attached by tapping it, creating a 1/1 Squirrel creature token.
3. When the Squirrel enters, Intruder Alarm triggers, untapping all creatures.
4. Repeat from step 2.

This clever loop hinges on turning your land into an animated creature with Nissa, Worldwaker so that it can pull double-duty as both a mana source and a permanent that triggers your other effects. By enchanting that land with Squirrel Nest, tapping it lets you churn out a 1/1 green Squirrel creature token, which immediately triggers Intruder Alarm's static ability to untap all creatures. Because your Nest-bearing land is now an elemental creature thanks to Nissa, the Alarm untaps it right along with your brand-new Squirrel, leaving you ready to tap and repeat the process for an arbitrarily large army of tokens.