By enchanting your land with Squirrel Nest, you transform it into a token-producing engine that fuels Intruder Alarm's global untap trigger every time a new creature enters the battlefield. To bridge the gap, Ioreth of the Healing House steps in as the active catalyst, tapping to untap your Nest-enchanted land so you can repeat the process indefinitely. Because Intruder Alarm untaps all creatures whenever that token arrives, Ioreth untaps right along with your newly minted squirrel army, letting you loop the sequence to generate an endless horde of creatures and infinite untaps.