Spawning Grounds + Intruder Alarm + Stone-Seeder Hierophant

Spawning Grounds

Intruder Alarm

Stone-Seeder Hierophant

How it works

1. Activate the land with Spawning Grounds attached by tapping it, creating a 5/5 Beast creature token.
2. The Beast enters the battlefield, triggering Intruder Alarm, untapping all creatures.
3. Activate Stone-Seeder Hierophant by tapping it, untapping the land with Spawning Grounds attached.
4. Repeat.

This engine is a masterclass in feedback loops, turning a single land tap into a self-sustaining army. By enchanting a land with Spawning Grounds, you gain the ability to churn out massive 5/5 tokens, which immediately trigger Intruder Alarm's static ability to untap your entire board every time a creature enters. To keep the mana flowing, Stone-Seeder Hierophant plays a dual role: its activated ability untaps your Spawning Grounds-enabled land so you can pay the cost again, while its Landfall trigger and Intruder Alarm's untap effect ensure the Hierophant itself is ready to tap right back to work.