This clever loop turns the unassuming Sand Squid into an active tap-outlet by tapping Warchanter Skald as part of its activation. Because Warchanter Skald is enchanted or equipped, tapping it triggers its ability to create a 2/1 red Dwarf Berserker creature token. When that token enters the battlefield, Intruder Alarm's static ability triggers to untap all creatures, resetting Sand Squid and Warchanter Skald so you can repeat the process to generate an unbounded number of tokens and creature enter-the-battlefield triggers.